Not sure if this is a region-exclusive thing, or global (since I don't have a phone that accommodates these sorts of things to find out).

It's a game on mobile devices (Apple and Android), called "Transformers Legends", featuring Gen1/Classicverse characters & forms. (although, Optimus looks like its from TFPrime, so could be like the original Universe toyline - with characters plucked out from multiple eras)

It's free, and you can sign up now to be notified when it launches.