I'd be disappointed if it had less than three internal drive bays. If they have 1-2, and tell you to rely on Thunderbolt, it would be disappointing since Thunderbolt peripherals are scarce and pricey.
My MacPro 1,1 is now sleeping in a corner. I purchased a 2012 Mac Mini with an SSD, and have 4 external 3TB drives in NewerTech enclosures (USB3). Yes, I gave up a separate video card and internal expansion, but it's running iPhoto, Aperture and iMovie very well, reads the photo and video files from one of the USB3 drives incredibly fast and meets all my needs. For the cost, I figured I can always upgrade it in 2 years and it would still be less than the MacPro. The MacPro was large and put off a great deal of heat. Besides, I needed to make a move, so I punted on the new MacPro. Perhaps I'll go back one day, but my set-up is working fine right now.
I am looking forward to seeing the new MacPro and I hope it's all we dream it will be ... powerful and expandable.