Speaking to Eurogamer, a Microsoft representative confirmed that the massively interactive game channel dubbed Primetime will not be available when the New Xbox Experience releases on November 19th. The MS rep also mentioned the possibility of a few other promised NXE features not being available day one of launch. Sad face.
Though, Microsoft is making it clear that Primetime and other features will be added to the NXE, mentioning that they'll have the "flexibility to roll out features and updates dynamically, unlike in the past where we were on a more biannual schedule." So, no prize winning Primetime on November 19th, but it'll come ... eventually.