I can't log in directly to the new forums (says that my Apple Id can't be used for these forums). However, I can log in indirectly to the new forums through the old forums.

Here, here! I keep getting hit with a bogus "your password has expired" message.

Change/make new your current password, then pick a new forum name here.

I did pick a new forum handle.

But if I attempt to log in from the forum page I get the message:

"This Apple ID cannot be used for this service. Please create a new Apple ID"

There's something very broken going on with these new forums. Perhaps someone should have beta tested them first?