Hello,
I just tried to play the game (on an easy setting so far). At the end of December of the first year, I got the corrupt town mission. After that, in January of the next year, I got the "completed single player" splash screen. After that, no more UFOs...
I do not think that I research everything (I only recovered a figher and a harvester, never a scout, never even saw a bigger UFO). I did about 40 missions.
Does that all seem to be about right? The rest is a question of being implemented at the moment?
Thanks,
D.