If you're one to believe analysts (ha!), note that Nomura Securities is forecasting that MGS5 will be out by March 2014. Apparently, Nomura doesn't realize how long it takes Hideo Kojima to get games out the door. [Nihon Securities Journal]
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I want more Metal Gear, but not Metal Gear Solid. Metal Gear Solid 4 was probably the best conclusion to a video game series I've ever seen, and to try to continue Snake's story seems a little out of place (and with Peace Walker, I don't know if we'd need another prequel).
I'm fine with Rising, however. I think that looks great and I like that they're bringing new experiences to the series. I've been hoping that Project Ogre isn't Metal Gear Solid 5, if it ends up being attached to the Metal Gear franchise, that is.
Either way, Zone of the Enders 3 in 2014 sounds much better!
Edit- Also, Metal Gear and Metal Gear 2 remakes would be really neat. Two games that I think would actually benefit greatly from/deserve remakes, unlike most games that simply use it as an excuse to give our childhoods an HD facelift.