Tell me what isn't 'current' about the new 27 inch iMac?
The 2012 iMac 27 is technically current, even if it hasn't been released and is the high end iMac, so I'll stand corrected there.
The iMac 21 comes with a 640m, which from I've read is is average at best for a decrete GPU in 2012 but the next generation will probably be announce and might be shipping before the Apple has the both the 21 and 27 iMacs freely available.
I shouldn't confuse the hardware that you should get vs what you do get and whats current. I will stand by the statement though that Apple does not always keep up with current GPU, CPU and IO. USB 3.0 started shipping in 2010, Apple shipped it in 2012. The Mac Pro still only has 2.0.
As I think about it... Apple GPUs are usually current (except MP), they are just usually horrible for a company that produces expensive workstations and claims to love visuals. A $1,700 rMBP 13 with it dual core i5 and HD 4000 driving two 2650x1440 displays under load very well.
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Believe me, I understand the concept of supply and demand but I don't agree that as a consumer you should support a platform that is not delivering, in this case the Mac gaming platform. Of course businesses will go where the money is and there will continue to be money in Mac gaming from casual gamers but hardcore gamers will never choose the Mac as their main platform for games.
The only MBP that doesn't have a discrete GPU is the 13" model which was never a gaming machine to begin with. Laptops are rarely intended for gaming due to the mobility components and small form-factor unless you count the Dell Alienware beasts and the Toshiba Qosmio abominations which use desktop components and weigh 11 lb with 30 min battery life, not meant to be lugged around.
The hardware that Apple uses is current generation hardware but what I think is more appropriate is to talk about whether it is high end or low end. The BTO options in the current iMac models are pretty substantial in terms of performance and thus far offer the best performance over their entire Macintosh lineup, including the neglected Mac Pro which still ships with a Radeon HD 5770.
I think that if gaming is your main concern then Apple will not be a wise investment.
I will concede that the hardware is USUALLY current, even is not a good value or choice. However it is not always current, that hasn't been true for years.
EDIT:
The fact still remains that Apple was 2 years behind on USB 3.0, the MP still doesn't have USB 3.0 even though it was updated this year.