Read the thread, this is not correct, even though the ps4 will have an advantage.
The wii will be slower, than both hd systems. probably bigger difference than xbox vs ps2, probably not as bad as hd twins vs wii though.
One thing is to have access to a whole 4GB pool at 192GB/s, the other is to access to a 32MB 'buffer' at 100GB/s and separately to a slow main pool at 68GB/s. Not considering that the total still favours the GDDR5 approach, which is something kinda surprising in a negative way because it raises the question of why not using GDDR5 in first place. And the answer could just be to be as cheap as possible.
Also talking about efficiency and other optimizations, there is no magic and whatever solution is available to one company has been available and discussed as well with the other. The know-how is the same, choices have been slightly different depeding on specific goals.
Microsoft is just using relatively cheap base hardware integrated into a big system on chip, trying to work around the most obvious limits using ad hoc solutions.There won't be miracles and we have already seen what kind of graphics this hardware can make with games like Star Wars 1313 and WatchDogs.
These considerations apply as well to Sony, they're going to be similar, although it seems they're going to have more brute force which is gonna help a lot in certain games and especially in the hands of first party studios.