Wow people can't really be that dumb....There aren't going to be anymore sigma....The only reason it was called ninja gaiden sigma in the first place was because they had to do something to the name to distinguish it from the xbox versions, especially with 2 because MS published 2 they had to call it something else Now that its officially Multiplatform they have no need for calling anything sigma anymore...It wasn't a super ultimate edition it was just a name to allow them to put it on PS3
That wasn't the only reason. Sigma had more costumes, missions, and playable characters. Sigma also means "summation" in mathematics, so it was supposed to be sort of a "super ultimate edition" as you called it.
I bought every single version of this series since the original Xbox (except Sigma Plus on the Vita) and yes, I would like to see this series continue but hope they do take their time with 4 and study Itagaki's blueprints and figure out how to make his games better. And please, ditch the cheap high health damage/1 hit grab kill in the harder difficulties in Sigma 2/NG3 as that is not how master ninja work in Itagaki's games.