I dont think Blood and Wine would influence the enhanced edition in any way?
Isn't that about adding extra stuff that has nothing to do with either expansion?
Think about sales potential. It doesn't make business sense to put out a (free, probably) EE before the expansions are finished.
Maybe the expansions would not be included with the enhaced edition.
I would see them being included in something like "complete edition" or "goty edition" while ehnaced is just a little extra content.
If more people buy the base game because it is promoted with an EE, then more will also buy BaW when it is released a couple months later. And if it is not "enhanced" much (it is more about marketing than any kind of major content addition), then it is not unrealistic to be released so soon, even if it is disappointing. But it could very well be fake - not necessarily intentionally, a couple of stores may just have incorrect information.