Treating it as a new language is the intent, and I'll make every effort
to keep them separated.
In theory there wouldn't be any problems. However if I screw up and
somehow cross the streams, I run the risk of breaking _lots_ of things;
yum is the most obvious victim in the critical path. Obviously I don't
want to do that.
I'm not volunteering to put it into F12. I think that anyone wanting to
push it into F12 needs to sign up for a lot of testing (brainstorming
some testcases: can you still compile and build external modules with
both 2 and 3 -devel subpackages installed? does every configure script
pick up the correct version? etc)