Oh no doubt. I don't have one yet though, so I'm watching closely. The new hinge makes it appealing for me, but I know it'll likely be the 6th gen that introduces more significant changes.
We all thought that the 5th one would be the significant redesign.
Personally I like the form factor of the 4 and don't need it to be too different. I really like being able to hold it in one hand when closed, which I can't do with many other slab phones these days. I wouldn't mind it being like 1mm wider, but that's it.
i love my flip 4, and i think that maybe i will upgrade to a fold 4 when the 5 series launch. So far my flip 4 is a great phone, solid, really well constructed and it erased all my fears of the folding screen durability. I think that the 5 series will be a little more expensive, and, normally, the 4 will get a discount, so is time for an upgrade from the flip to the fold.