I recently read that Bungie will not allow Xbox One players to play on the same servers as Xbox 360 users. Microsoft doesn't create separate versions of Xbox Live for 360 vs One players, so why does Bungie? They claim it is for fairness reasons in terms of shooting accuracy in multiplayer (i.e., higher pixel density on next-gen systems gives those players an advantage). If that's the case, then fine, but don't prevent me from raiding with my Xbox friends who can't afford to buy the Xbox One yet! Lame!! Please fix Bungie.
It's not lame. Anybody who EXPECTED this to happen was either being ignorant or far far far too hopeful. The fact your characters can cross between the 360 and One is impressive to me. When your friends upgrade they'll still be able to use the characters they made with the gear they acquired.