Characters can link their normals together and finish off with a flashy special, activated by the usual quarter circle and dragon punch motions, common to fighting games. (wccftech.com)
I went a different direction, and made the medium dragon punch a one hit attack that always knocks down and is totally invulnerable on the way up. (sirlin.net)
I gave the fierce dragon punch much more horizontal arc, similar to the huge arc Ken had in SF2: Champion Edition. (sirlin.net)