Here is a list of some Thunderbolt 2 devices out now or just around the corner. Obviously there are a lot more Thunderbolt 1 devices available but tried to keep this list to TB2 devices in support of the new Mac Pro. If you know of any other TB2 devices, please feel free to add them to the list.
External Enclosures / Expansion boxes
Sonnet's Echo Express II and III models
http://www.sonnettech.com/product/echoexpressiii.html
Sonnet's Echo Express III enables you to connect three compatible full-size professional video capture, audio interface, and other special-purpose cards to your iMac®, Mac® mini, new Mac Pro®, MacBook Air®, or MacBook Pro® with a Thunderbolt port. Featuring 20Gbps Thunderbolt 2* technology.
Added 16th Jan:
Magma Thunderbolt 2 PCIe Enclosures
http://www.magma.com/blog/magma-release-thunderbolt™-2-versions-its-popular-expansion-products
Magma today announced the planned release of a Thunderbolt™ 2 compatible version of its popular EB1T, EB3T and ROBEN-3TS and 3TX expansion computing systems. The updated products will carry the same prices as the original, Thunderbolt™ versions, and will begin shipping to select resellers by February 28th
Audio Related
Blackmagicdesign UltraStudio 4k for Thunderbolt
http://www.blackmagicdesign.com/uk/products/ultrastudiothunderbolt
UltraStudio for Thunderbolt™
The highest quality capture and playback solutions for your Thunderbolt™ computer!
AJA Video Systems - Io 4K
http://www.aja.com/en/products/io-4k
Io 4K is the next evolution of capture and output hardware offering a full set of professional video and audio connectivity with support for the latest 4K and UltraHD devices. The power of Thunderbolt 2 enables Io 4K to handle a wide range of formats from SD to HD, UHD and full 4K over both SDI and HDMI.
External Storage
LaCie Little Big Disk – Thunderbolt 2
http://www.lacie.com/products/product.htm?id=10621
The World’s Fastest Portable Storage.
1,375MB/s* speeds for 4K video editing. Dual Thunderbolt 2 ports for daisy chaining
Compact size for field-based creative workflows. Whisper-quiet dual cooling
http://www.tomshardware.com/news/storage-flash-thunderbolt-lacie-little-big-disk,25671.html
Promise Pegasus2 Series
http://www.promise.com/promotion_page/promotion_page.aspx?region=en-global&rsn=100
The Pegasus2 is the fastest and the only Thunderbolt 2 enabled hardware RAID storage available in the market. Showcasing Intel's revolutionary Thunderbolt 2 connectivity, the Pegasus2 boasts a staggering speed of 20Gb/s - more than enough to effortlessly handle and accelerate any 3D or 4K (Ultra-HD) workflow environment.
Networking
Promise SANLink 2
http://www.promise.com/promotion_page/promotion_page.aspx?region=en-global&rsn=103
SANLink2 is a compact device that allows a Thunderbolt™ 2 host computer to directly connect to a Fibre Channel SAN
Displays
LG Thunderbolt 2 Monitors
http://www.lgnewsroom.com/newsroom/contents/64053
Designed to deliver an unparalleled home entertainment experience, the UM95 supports a variety of advanced connectivity options, including Thunderbolt™ 2.
External Enclosures / Expansion boxes
Sonnet's Echo Express II and III models
http://www.sonnettech.com/product/echoexpressiii.html
Sonnet's Echo Express III enables you to connect three compatible full-size professional video capture, audio interface, and other special-purpose cards to your iMac®, Mac® mini, new Mac Pro®, MacBook Air®, or MacBook Pro® with a Thunderbolt port. Featuring 20Gbps Thunderbolt 2* technology.

Added 16th Jan:
Magma Thunderbolt 2 PCIe Enclosures
http://www.magma.com/blog/magma-release-thunderbolt™-2-versions-its-popular-expansion-products


Magma today announced the planned release of a Thunderbolt™ 2 compatible version of its popular EB1T, EB3T and ROBEN-3TS and 3TX expansion computing systems. The updated products will carry the same prices as the original, Thunderbolt™ versions, and will begin shipping to select resellers by February 28th
Audio Related
Blackmagicdesign UltraStudio 4k for Thunderbolt
http://www.blackmagicdesign.com/uk/products/ultrastudiothunderbolt
UltraStudio for Thunderbolt™
The highest quality capture and playback solutions for your Thunderbolt™ computer!

AJA Video Systems - Io 4K
http://www.aja.com/en/products/io-4k
Io 4K is the next evolution of capture and output hardware offering a full set of professional video and audio connectivity with support for the latest 4K and UltraHD devices. The power of Thunderbolt 2 enables Io 4K to handle a wide range of formats from SD to HD, UHD and full 4K over both SDI and HDMI.

External Storage
LaCie Little Big Disk – Thunderbolt 2
http://www.lacie.com/products/product.htm?id=10621
The World’s Fastest Portable Storage.
1,375MB/s* speeds for 4K video editing. Dual Thunderbolt 2 ports for daisy chaining
Compact size for field-based creative workflows. Whisper-quiet dual cooling

http://www.tomshardware.com/news/storage-flash-thunderbolt-lacie-little-big-disk,25671.html
Promise Pegasus2 Series
http://www.promise.com/promotion_page/promotion_page.aspx?region=en-global&rsn=100
The Pegasus2 is the fastest and the only Thunderbolt 2 enabled hardware RAID storage available in the market. Showcasing Intel's revolutionary Thunderbolt 2 connectivity, the Pegasus2 boasts a staggering speed of 20Gb/s - more than enough to effortlessly handle and accelerate any 3D or 4K (Ultra-HD) workflow environment.

Networking
Promise SANLink 2
http://www.promise.com/promotion_page/promotion_page.aspx?region=en-global&rsn=103
SANLink2 is a compact device that allows a Thunderbolt™ 2 host computer to directly connect to a Fibre Channel SAN

Displays
LG Thunderbolt 2 Monitors
http://www.lgnewsroom.com/newsroom/contents/64053
Designed to deliver an unparalleled home entertainment experience, the UM95 supports a variety of advanced connectivity options, including Thunderbolt™ 2.

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