Maybe they didn't update the wikipedia, but according to the director and producer (SFV and SF6 will have the same director and producer), SF6 is being developed basically by the same team as SF5. They said that just after SFV Arcade Edition release, a part of the SFV team started to work on the preproduction of SF6 while the biggest chunk of devs continued updating SFV and over time they slowly started moving to SF6.
Counting everything over 20 different studios (nothing rare in AAA games) work in SFIV, SFV and -apparently, since it's the same team- SF6. Dimps were the lead development team in SFIV and SFV, where Capcom had a small in-house teams. SF6 apparently has a way bigger budget and scope, which I assume means it's going to have a lot more devs involved. Probably means that now they'll have a lot of in-house Capcom devs more and maybe their in-house dev team took the development lead now.