well there is the Wizards tower, Thieves Den and the Vile Lair, go check www.Xbox.com
If you need more data on those. I don't know the details about this Blu-ray/dvd thing, but I wouldn't hang him completely for one mistake he made about new technology.
RAM or hardrive/disk data? I dont see why a new location or creature on the screen would require more than the normal amount or ram. And even if it did, couldnt textures be lowered to make it fit? They are saying horse armor can't be on the screen at the same time as this tower/den/lair? It all sounds like BS to me. I have a feeling it has to do with xbox live content not allowed on PS3's store, and vice versa (that they may not be telling about). I mean is there any example of multiplatform DLC so far? I'd even accept blu-ray speed being the cause of not having a specific location streamed, but could think of another way to get around that as well (hard drive cache).
And btw hes made more than one mistake about technology before. I just find that one to be the funniest one. He gets called the "old guy" on the 1up yours show by his co-hosts for a reason. And as I said before hes infamous on gaf for sometimes not stating correct information.