Re: The numbers being the prediction
Re: Imacs: You can now get i7's @ 3.4ghz. Hardly midrange. Graphics are, however, and unlikely to improve given the form factor does not lend itself to serious GPU hardware.
Re: Mac Pro: So they're last gen Westmere's not Sandy bridges - you're still looking at 12x 2.9ghz Xeon's with DDR3. While not cutting edge, they're not exactly slow. And given the target useage of the Mac Pro's a 5870 is hardly skimping (though i take your point - you should be able to spec a 6xxx or 7xxx at the factory, rather than have to re-BIOS a PC unit). I anticipate a jump straight to Ivy shortly, as Apple are not usually tardy updating the Pro range.
Re: OSX. Gotta agree here - keep IOS touch candy out of OSX please, Ta very much.
Re: Apps: Actually I don't think this makes the slightest difference; if you can attract newbs with simplified features and wizards while retaining the 'pros', go for it, I say.