I'm going to wait till the US version comes out. No point in me playing the EUR version and suddenly a patch is needed for online.
about this; I believe the way they have it set up now is that; if you don't have the same version as the person you're trying to connect to it won't let you go to that world. But as long as you both have the same version ex: You have 1.0.0 and your friend has 1.0.0 . You should be able to connect to them perfectly fine.