According to a recent interview with Capcom’s Tomoaki Ayano, the process of porting in characters from Street Fighter X Tekken to the Street Fighter IV engine for Ultra Street Fighter IV was actually pretty deep. The first step was to just put them in the game, keeping all their moves intact. Then, after that they added ultras and super combos to fill in the gaps that Street Fighter X Tekken characters had in the SFIV engine. However, there was a lot of other work done as well, to make them play more like traditional Street Fighter characters. For example, many of these characters were designed with SF X TK mechanics in mind, like the cross rush or juggle combos, and so the combo properties of many moves had to be fiddled around with.
“There are also plenty of tweaks under the hood that might not be obvious at first glance.” Ayano said. “Most moves in Street Fighter X Tekken could be used for air combos, but the parameters have been adjusted to suit the play style and rule set of SFIV this time around, so only certain specific moves can be used in that fashion. Getting more technical, the whole method by which hit boxes and hurt boxes are applied and adjusted differs between SFXT and SFIV , so those have been changed in all instances, whether a character is standing, crouching, or jumping, etc.”
“There have also been a host of changes made to move properties, frame data, and the like that will allow for new combo opportunities. I encourage users to experiment with these characters to see what is now possible.”
Ultra Street Fighter IV will be available as a downloadable update for the Xbox 360 and PS3 versions of the game in June for $14.99. Full standalone versions of the game will release on the Xbox 360 and PS3 for $39.99 in August, as well as a $29.99 PC version. Exact dates for the game’s release have not been given.
Source: Siliconera