I feel for those of you who were let down by this announcement.
That said, there's a lot of Pro users in other areas for whom this will be fantastic.
- Audio engineers / recording studios - even with the M1 Mini, we saw remarkable multitrack recording power. M2 Ultra will turbocharge that yet again.
- Users of Universal Audio (UAD) DSP cards will be able to migrate to Apple Silicon, so they can run all their plugins and UAD's Luna DAW which requires their hardware for realtime audio monitoring.
- Similarly, Avid ProTools users can use their HDX cards to enable DSP-powered aspects of that DAW.
- General 2D arts will be pretty fantastic on it - it'll be a killer machine for HDR photography flows, video and cinema work.
- CAD / design / rendering / architecture stuff!
- I expect everyone with a desk cluttered with external capture cards, SSDs etc. will be happy to be able to put those into PCIe slots.
Let's also not forget that this is a jump to PCIe 4.0, which is 2x the speed of the previous generation. (I suspect that Intel's delay in implementing PCIe 4.0 is why Apple had to invent the MPX module and connector as a workaround.) 4x speed on this system will equal 8x speed on the old one, 8x = 16x, and 16x = 32x by comparison.
As it has two x16 slots, that's like having four on the old MP 7.1, or 2x 32x, and four 8x slots, equals eight on the old one. So that's a lot of bandwidth for peripherals. I expect there will be some kind of compute card or AS GPU to make use of it, mostly because Apple's certainly betting that the new MP will be needed for developing apps and content for Vision Pro.
Lastly, given how power-efficient the M-series chips are, if it has roughly the same thermal management as the previous Mac Pro, that gives the M2 Ultra a lot more thermal headroom vs the Studio. I look forward to seeing the benchmarks.