Wanted to add a comment on the ongoing idea abotu eDRAM thingy, however im still 3 pages back so still reading to get here so i'll be short:
I think that might actually be a CPU thing and might not have anything to do with the GPU's discrete(?) memory. Anyway it goes, i would be disappointed if the console will have only 1 GB of whatever memory, just won't compete in long-term. Memory is so much more important just makes all that hardware useless if you peak the mem out you can't make games better, no matter how fast the CPU, GPU is, this is exactly what Carmack from ID Software points about in many interviews.