I've only barely seen very little, tiny bits of the 4400 so I can't comment on the similarity to that. It does sound like X Men. But many of the mutants in X Men knew they were different from the time they were kids whereas most of the people in this show had only realized something was different about them for a short while. I'm not explaining it well but it seemed different than X Men to me.
Just watch it. I command you!
Then you can see the cool previews for next weeks show and be hooked like I am.
