From what I've read over the last couple of weeks it seems 2 factors stand out as being critical to the success of the new mac pro: 1) Pricing: I suspect Apple will try very hard to make an entry level MP attractive to as wide a user base as possible. > $3000: it will be limited to a very small number of people, probably working in video production, who see dual-GPUs as value for money. $2500-3000: Some wider interest from professionals in a number of fields, but limited sales $2000-2500: this will appeal to a lot of people who just want a high-end desktop, and need a bit more power than an iMac / MacMini / MBP can provide. I fall into this category (software development). If Apple can get it closer to $2000 than $2500, they will do well. I don't see it coming in under $2000 unless they make the entry level spec very close to the iMac (e.g. 4 core, 8MB, 128GB SSD). 2) Thunderbolt peripherals. There is still a very limited selection of TB peripherals and enclosures and the prices are off-putting. The new MP needs to launch with some reasonably priced standard peripherals (single disks, small & medium arrays, PCI-e expansion chassis). TB is still worrying a few people, I think, in terms of price, availability and future viability. I still can't find a reasonably priced external enclosure for a 2.5" SATA SSD. The future will tell!