I hope so.. but we might have to wait. Found this from the Seibetron forum:

As far as your question "will TakaraTomy release Ultra Magnus?" - I am pretty sure they will. He may however be an upcoming exclusive since he was released as a store exclusive in the U.S. There seems to be an agreement between Takara & Hasbro that exclusives in one country will remain as exclusives in the other.

Presently there are four Henkei exclusives lined up - Skywarp, Thundercracker, Clear Prime, and Nemesis Prime. Takara is probably waiting for these exclusives to be finished before announcing Ultra Magnus, especially since two of these figures use the Prime mold.
http://www.seibertron.com/energonpub...st=0&sk=t&sd=a

Fingers crossed, though I AM still hope someone will sell me their loose Ultra Maggie for now..