I think the next revision of the Mac Pro may be nothing more than new pricing for the processors and new high end GPU options. 2900XT or perhaps 8800GTX, maybe they'd also offer 8800GTS as another way to go, or the sole choice (yuck). Then 4600 or maybe 5600 quadro cards (based on the nvidia 8 series), but dailytechs numbers showed the 2900XT bested them on benchmarks. The 7300GT is a pretty ideal base card for the MP, those who don't need 3d graphics performance don't need DX10 cards, the 7300GT is low power and low heat which is why it was chosen.
Also I wouldn't expect anything other than a 250GB drive as standard, I just don't think 500GB as standard is best catering to the customer base. As for the memory being standard at 2GB, well it would be nice and FB-DIMMs have dropped to a price that would allow it. Though if Apple can get a better deal on 512mb expect it to still be in that form, which would be kind of sucky.
The stoakley platform looks like it won't be released until later in the year, maybe before penryn Xeon's, but maybe not. There still is little information on when either will be comming.
I haven't looked too much into the stoakley stuff, i know there was a huge thread launched by multimedia about it and I figured it would be coming sooner than what you say. I will have to look into it, but thats why i said maybe for that.
I think an 8 series card makes sense, even though the 7300 is a good bottom of the line, it isn't anymore. I think the MBP update acknowledges that, a low end 8 series, and top end 8 series of HD2xxx series, and a Quadro would be a good line up and would be keeping with the times.
The standard now is 250GB, which I think was bumped not too long ago (with the Quad update I think.) 250 is good, but 500 would be nice especially with 1TB making its way into the foray. Any upgrade IMO is catering to the customer base. If i can get 500 for the same as 250 that is good.
512MB in general is on its way out. Soon it will cost more to use since it won't have the supply. Take a lot at OWC pricing:
2GB in 512MB modules is: $289
2GB in 1GB modules is: $189
$100 difference, that is pretty significant. When you get to 4GB it is even worse with a $250 difference between 512MB stick and 2GB sticks. That is hug!
Anyhow, soon or even now, it will cost Apple more to use those 512 stick regardless of any special pricing they may or may not get. 2GB is coming. I stand by that statement.
I am not trying to argue, but I think what I am saying makes sense (of course this is Apple we are talking about). I just can't buy today with the price drops and MBP upgrades in my mind. If they don't update next week, I am holding out until they do, because I think I will get:
Better CPUs
More RAM
Better Video
Maybe:
More HD stock
Better mobo