Lower your expextations or you'll be disappointed, I doubt it's something really huge, he wouldn't drop hints in that case because CBS would rip his head off.
Lowering expectations is probably a good idea. But I highly doubt CBS would be angry with him. A: Star Trek Discovery is probably almost at the hallway point of filming the first season. B: He's done two Trek movies for Paramount, CBS is well aware of that and wouldn't negate him from pursuing that avenue if that is the case. If it is the next movie its probably just slowly starting to gear up if we're looking at a 2018 or 2019 release.