I was actually playing Skyrim up until about a month ago, along with Dragon Age Origins, but then I got fantasied out and decided to re-play FO3 - and while checking for new mods and updates I learned about the up-coming FO4 release
So I've decided to finish that playthrough, and then do another FNV run with all the DLCs (which I bought but never got around to actually playing...) before I play FO4. I figure by then it'll have gone through a few patches and be better for it.
But I will be curious to see what they improve on from Skyrim, along with New Vegas. I believe I read that some of the newer features in FNV (like needs and weapon modifications) were inspired by mods, so it'll be interesting to see what they take from the modding community of both games and add to Fallout 4. (Crossing my fingers for more interesting, fleshed-out companions and NPCs - since this is a huge opportunity in Fallout and especially Skyrim).