Did not see one of these threads started yet so thought I should start one up.
Post your working/partial working mage related addOns on MoP [Beta] and I will add to the list. If it is partially working if you would be so kind to post what is and what is not working about it, I will be sure to add that into the list.
[Working]
-OmniCC
-DBM
-Elvui
-Tukui
-Weakauras - https://github.com/Milyardo/WeakAuras-Beta
-Recount [Alpha]
-bbars
-NugRunning
-Ignition
-gtfo
[Partially working]
-Skada
-Quarts
[Not-Working]
-Recount
-Power Auras
-Bartender