2.6 is a bridge to 3.0 -- it implemented some 3.0 things, but kept a lot of backward compatibility. If a project can't convert to 3.0, they could convert to 2.6

2.6 is a bridge to 3.0 -- it implemented some 3.0 things, but kept a lot of backward compatibility. If a project can't convert to 3.0, they could convert to 2.6, which would then make the eventual 3.0/3.1 migration easier.