Creator of Metal Gear Solid has already stated that the 3DS is capable of PS3 level graphics. (Don't expect to see any screens showing this yet, as nearly everything shown off thus far has only been a tech demo to show off the 3D, and Kid Icarus was being worked on back in January of 2009 when the 3DS was just starting out and had likely much weaker graphics capabilities), The Metal Gear creator went on to say that they'd have showcased this at E3 if they had more time to work on the product displayed there, but what was most important was to show off the 3D. OOT remake is going to have graphics on par if not better than Twilight Princess according to Nintendo.
Again, if graphics that powerful (360/PS3)aren't grown up (which honestly I don't get the big deal about graphics, if it looks cool it looks cool, and even all these very early tech demos still looked damn cool), then I still don't ever want to grow up lol.