I like your list...
The Samaritan video/demo was just to show of the ehancements to unreal engine 3, Epic has stated it's not actually a game in development, though that could change. It's not even Unreal Engine 4....
I think the 360 successor won't release till 2013, but the reveal will be at next years E3 to take a bite out of Nintendo's 2012 Wii-u Launch.
This launch lineup is based on that timetable.
First party MS games - Fable 4, a new Killer Instinct from Rare, and a new FPS. Whether that will be a improved Halo 4, a Remake of Halo 2, a GOW game, or a FPS from rare, I have no idea. I'm not thinking Alan wake 2 will be a launch title. In the last few months i read that remedy was shopping for publishers, so that might mean MS isn't publishing it. I guess we shall see. I think MS will have three first party hardcore launch titles, but might have a few first party kinect titles.
Third Party launch games - Fallout 4 from bethesda
An upgraded COD game (that will be at lower res and performance on the old consoles) from activison
Possibly a new Beyond good and evil, and some kinect style games from Ubisoft.
EA will have a few sports titles and a Bioware title in the launch window.
If that Crytek game doesn't get released in 2012 for 360, that will be a launch title.
Something from Square-Enix maybe....
Controller wise, headsets by default will be wireless, and there will be an something like the vita's touchpad or extra buttons on the bottom of the controller.
The next system will have kinect in the box, I just hope MS doesnt focus on it too heavily. I bet they have plans for a lot more physics with the next xbox and its built in kinect too.
My hope is it will have 4GB of memory and a nice large HD, or be able to use your own. 1080p will be its native res, no more upscaling, i hope.
Lastly, the "loop" may not be an xbox but a device that will sell along side of it, to give you controller options not possible with just connect and a controller.