According to Game Informers 2015 release schedule (
link) my list for the 3 first months will look like this:
January:
Life is Strange (PC)
Resident Evil Remake (PC)
Grim Fandango (PC)
Blackguards 2
Still not sure about GTA V, Dying Light and Saints Row IV: Gat out of Hell
February:
Evolve (thank you cheap Indonesian Steam store)
The Order: 1886
Still not sure about: DoA5: Final Round and Total War: Attila.
March:
Code Name: S.T.E.A.M.
Bloodborne
Still not sure about: Project CARS, FFHD Type-0, Screamride and BF: Hardline.
So january is overall the biggest month.