Actually, it is pretty much guaranteed that everything WILL change. Also, most everything will be in the boxed set, so, when the redo all the Codexes(which they ARE doing, believe it or not), they will be much smaller. More like the Assassins Codex. It's also rumored there will be multiple versions of the boxed set, like:(posted 9358 days ago)1) Just the rules. 2) Rules and Dark Eldar. 3) Rules and Marines. 4) Rules, Marines, and Dark Eldar.
Once again, PORTENT(mentioned above) is a very good source of information, as I've yet to see them be wrong. That scares me, though, because one of their rumors involves the Orks getting bagged, and that's something they just can't do...
Thank you all for visiting.
-BludRedd Kroeger