According to a supposed retailer source who has been vetted on Reddit's NX board, NX is rumored to be getting priced at $300 with no less than 4 games guaranteed to be available at launch and one to be a Mario game.
Also rumored to be having a bundled option for $400 and retailer demos to arrive by February. NX also rumored to support 4K for media streaming but not for gameplay.
NX could end up as the console's official name since retailers are still in the dark for its name and recent batch of promotional stuff still had the NX name on it.
Reddit's NX board mods are doing everything possible to keep their vetted source secret since some of the leaks if legit could cause possible legal issues against the source and/or retailer.
There is a catch though, Reddit's NX board mods still state its possible this new stuff could end up being fake even though their source has been given top verification status. Has to do with previous incidents of high level sources revealing stuff that was quickly debunked.
http://www.neogaf.com/forum/showthread.php?t=1291439