Yes, post an outdated kotaku post. Totally legit.
In recent interviews they've said that they are a-okay to make a new guilty gear. Sega only ever had the rights to publish the next guilty gear anyway iirc, not the IP itself.
I was asking about GGAC+, seeing that sega published it so I dunno if it's up to them or Arcsys to put it on XBLA and PSN.