675m is a rebranded 580m using 40nm, not the new kepler 28nm... anothewords nvidia's 2012 "flagship" mobile gpu is literally the same specs as last year's fermi technology (384 CUDA Cores running at 620MHz, coupled with 2GB of GDDR5 and a 256-bit memory bus)
math is hard nvidia; way past immoral and bordering on false advertising imo
(the 660m is going to be 28nm but 32 gb/s less bandwith than 580/675m)
this next part are rumors, albeit all consistent with eachtother by reputable sites, makes this even worse.
Ivy bridge is going to be on the same scale as BD disaster, which makes it a worse tragedy considering intel's R&D ratio. Like the false advertising above, unmotivated by competition and just sheer lazy Intel's Ivy bridge was supposed to be a promised 77W TDP, and now has changed last minute to 95W tdp which absolutely screws you, the consumer, but also every manufactorer involved with building components around this horrible fail which results in horribly planned out laptops. On another note, enthusiasts who build their own computers will be screwed the most, as even modest overclocks put ivy bridge over 100 celsius. Sandy bridge owners who bought their $200 microcenter 2600k and getting 5ghz are laughing at everyone who waited for ivy bridge.
So unless you want to pay more for a worse product, and become a burn victim via thighs(sli and ivy bridge=molten core, no pun intended), you should probably get a Origin/Clevo laptop. If you're going to seriously buy an alienware, you obviously don't know about origin/clevo, but at least buy an alienware now before these rebadged parts and ivydisasterbridge go in, here's $50 coupon for the m14: BHW1L0MX0D?MCX
Good luck to you because there basically are no good options, only mediocre at best or...
best bet is to wait until haswell and real gk110 mobilized parts go into laptops and just keep using what you're using, or if it's really old, get a 580m sandy bridge laptop. not like any games, even crytech 3.0 and frostbite 2, are pushing any tech newer than a 580/6970 for single display