Few months back I've registered for 8.1 preview for developers & installed it. Recently I got the cyan update. Now am I still on preview? Can I uninstall the developer app? It might be looking silly.. But I am in a totally confused state..
You are still enrolled in the Preview and receive any new updates by MS. It doesn't just go away when an update is released. (in this case, 8.1 Update 1 is likely on your phone unlike normal 8.1 that is on phones with Cyan.)
I wouldn't recommend uninstalling the Preview app unless you want to disable future Preview updates. (You CAN, but I don't really see why unless you want out.)
I can't spend too much time on this, but I hope that helped...