While everything is speculation until the official announcement, we do have some hard facts: Apple's plan for expandability with the new MP is riding entirely on Thunderbolt. Six of them. 36 devices. Pretty impressive. My entire livelihood relies on my MP 3,1. It has four internal HDDs plus a SSD and an upgraded graphics card. It's near the end of it's usable lifespan so I'll be looking to sell it for a replacement soon. Whatever I upgrade to I'll need a 4bay USB3 enclosure for my scratch drives. Now I'm looking at the current iMac line-up, which can support 12 TB devices (more than most users will ever use) plus the USB3. It looks like the new MP is a massively overbuilt iMac without a screen. iMacs have the same (albeit fewer) "expandability" ports. If iMac can handle external PCI chassis just as well as the MP I feel like a fully spec'd iMac is significantly better bang-to-buck than whatever the trashcan's final pricing ends up being. Unless it's closer to $2k than $3k. Is there something I'm missing?