One, there's no guarantee an inhouse netcode would be any good in the first place. It took Capcom a long time to even try inhouse Rollback, and they still have it messed up with sound issues and the inability to adjust the delay to your liking. On top of that, they've shown they do have games with decent netcode already, short of complications it's more of a matter of applying said netcode to newer games.
Two, there's no reason for them to say they're developing a new netcode when XIII is still the focus. A new netcode is irrelevant until...you know there's actually a new game to make a new netcode for, and again, XIII is still the focus.
If this is a problem for you then put away XIII and play the other dozen FGs that are out there. Lack of news they have no obligation to give out will be a lot easier to deal with when you're preoccupied with something else.