1GB VRAM is unlikely since the highest density GDDR3 is currently 1Gb (128MB) and Apple only has space for 4 chips for 512MB max. Those specs are also inconsistent since it's unlikely that Apple would go to all the trouble to source a GPU (GT330M) just to use it in only 1 model.13"
Core i5 430M/2.26G/Intel HD/NV 310M/2GB/250GB/1199
Core i5 540M/2.53G/Intel HD/NV 310M/4GB/320GB/1499
15"
Core i5 540M/2.53G/Intel HD/NV GT330M(512MB)/4G/320G/1799
Core i7 610E/2.53G/Intel HD/NV GT335M(512MB)/4G/500G/1999
Core i7 620M/2.66G/Intel HD/NV GT335M(1024MB)/4G/640G/2199
17"
Core i7 620M/NV GT335M(1GB)/4GB/640GB/2299
(BTO Core i7 720 +200;Core i7 820QM +500
http://taisyo.seesaa.net/article/146433371.html
I'm still hoping for a last minute reprieve to get ATI HD5000 series graphics. Although the only good thing about this rumour is that a GT335M would at least be acceptable from a performance standpoint to ATI's mid-range GPUs.