Obsessing is such a strong word.
Antecipating or greatly invested in sounds better. :p
I am investing greatly on Fire emblem awakening at the moment.
My most antecipated game varies from time to time. When antecipating i go on youtube and rewatch some footage.
I am currently antecipating FE fates, TMS#FE, GGXrd revelator and KOFXIV. I guess WoW Legion... but it's more cause i'm sick of warlords.