Ok not quite that bad

but it seems they are making macros and keybindings stored serverside in WotLK and as always they are limited to 255 characters..
I don't know about you, but that is going to nearly kill all my epic macros and make life hell
they are increasing the total macro count to 36, But to me this seems rly rly lame!

Source

It's not going to end my Mboxing career, but it sure is going to hamper it a lot :S