I think once most buyers factor in all the upgrades they want they'll see similar pricing on the high end models to what we see today, but a somewhat lower entry point wouldn't surprise me at all.
I predict the entry price will be somewhere in the 3000-4000 range and that will be for a system that is on par with a $2000 PC. I think it will definitely be higher than the current entry price based on the graphic card config. FirePro cards are way more expensive than the current entry level cards. Not only that, but the PCI flash drive isn't going to be cheap either, definitely a lot more than the base drive offered in the current gen. What they're describing sounds like a Revo X2 drive which goes for about $1K at 480GB.
But lets be honest here. Who wants an entry level Mac Pro? We all want the kind of blazing performance that Blackmagic and The Foundry have been raving about, otherwise whats the point, right? I can pretty much guarantee that the systems they've been testing feature two 6GB FirePro cards which go for about $3K a pop. Put in a pair of those and you'll get performance on par with a pair of $1K GTX Titans.
Don't let the small form factor fool you. This thing is not going to be cheap.