KSR is one of the few exclusive games (maybe the only one) that have release dates; it's coming out on April 8 in NA and April 11 in EU. Exclusives that don't have release dates yet include:
D4
Below
Project Spark (XB1 beta will hopefully be out in the next week or two)
Sunset Overdrive (confirmed 2014)
Quantum Break (rumored to be a Holiday 2014 title, but it could slip into 2015)
Killer Instinct gets Fulgore/Story Mode/Arcade Mode in March. Titanfall will get map packs this year too, I expect.
Then of course there are the rumored Halo 2 Anniversary and Forza Horizon 2, or perhaps other titles that have been neither rumored or announced.
That seems like plenty of content to me. I plan on getting Spark (F2P, but I'll likely spend money on it), QB, SO, and probably H2A, in addition to a number of 3rd party titles (Divekick, Child of Light, Destiny, Witcher 3, Shantae: Half-Genie Hero), so I should have plenty of XB1 games to occupy me throughout the year.
