Back Mount - Rear Naked Choke, Armbar
Back Side Mount - Kneebar
Crucifix - Armbar
Full Mount - Armbar, Gogoplata, Triangle Armbar
Guard (Dominant) - Heel Hook
Guard (Submissive) - Guillotine, Armbar, Omoplata, Triangle
Half Guard (Dominant) - Arm Triangle, Kneebar
Half Guard (Submissive) - Twister, Kimura from Half Guard
North South - Windshield Wiper
Rubber Guard - Gogoplata, Armbar
Side Control (Dominant) - Kimura, Inverted Triangle
Side Control (Submissive) - D'Arce Choke
Side Saddle - Arm Triangle
Sprawl - Japanese Necktie, Peruvian Necktie, Anaconda
Stacked Guard - Heel Hook, Kneebar

Source: http://www.easports.com/ufc/news-updates-gameplay/article/ea-sports-ufc-tips-and-tricks-submissions

No triangle from rubber guard? I'm disappointed