I think we al want to use wxWidgets 2.6, and I think (as said before by someone else) it would be easier when we use a sperate branche for it. And I know there is much trouble with C::B using wx2.6, but when there is no one who is hunting these problems down and fix them, it will never get used.
On the other hand, I don't know what the plans are. When the Code::Blocks 1.0 final is released soon, then we can wait with make a branch for wx2.6 until we have a stable release. Perhaps Yiannis could tell us more about this?
In my opinion we should wait with wx2.6 util we released a stable C::B final. after that is released we should make a branch for bugfixes of that stable version and use the head for wx2.6 support.