All reports and rumors so far point to the M1X chip being an absolute monster. I haven't seen a single rumor or leaked report to the contrary. That's not to say it's true, but there is nothing pointing to just a minor spec bump so far. If I were a betting man (and I am!) I would certainly put money on it being significantly better than the M1. If it has double the performance cores and quadruple the graphics cores it's going to smoke just about everything out there.What they would be disappointed by is if they bought the first set of M1 Macs, then are expecting the next set to be tons better than theirs, only to find out that it was a minor spec bump. They would be disappointed by the NEW macs coming out this year, not the M1s they already have.
Plus there are so many other things that will go into this computer to make it fresh. I can't see any disappointment apart from the MiniLED screen. Let's hope that isn't going to be an issue.