Unconfirmed. It was stated at E3 that they were working on a way to transfer from Gen 5 to 6, but that nothing had really worked yet. They hinted that it would probably end up being through an app or something, like put in Gen 5 game and upload Pokemon, put in Gen 6 and download Pokemon.
What does a nosy pepper do? It gets Jalapeno business. Official Frank Zappa of Every Board
It hasn't ben confirmed yet but maybe there will be a Gen 5 backwards Compatibility. I would much rather be able to catch everything in X and Y but it would at least be possible to get your Mon from the last few - and the GBA Games - into Gen 6.