Ryu isn't the only crossover character coming to Asura's Wrath. Capcom shared a couple of additional screenshots today showing another SF character:
Akuma will be in the game's fifth download content, which is due on May 15, priced ¥200/160MSP. Ryu will be in the game's fourth download content, which is due on May 8 at the same price.
Outside of these screenshots, Capcom has not yet shared details on the two DLC packs.
The Akuma pics were included in a notice Capcom sent out about the game's second DLC pack, which was released today.