HL3 and TES VI will never release. Those are pipe dreams. I'm going with GTA VI, because I think Take Two Interactive disclosed in their Form 10-K that they had a major IP releasing at the end of calendar 2024. For context, the SEC really doesn't like it when firms fuck around on those forms.

A 5 or 6 year window between massive titles is pretty normal these days. 5 years separated GTA IV and V. Also, 5 years also separated GTA V and RDR2.

Looks like the might have a 6 year gap this time, but they also had a global pandemic mucking up development. A lot of studios struggled with that.