Probably more of a balance issue, but posting just to make sure it is known.
Easy difficulty, Day 15 of the first month and I have multiple UFO sightings at a time (3-5 UFOs within a few game minutes or hours of each UFO being detected) and my F-17's can't catch the UFOs. Then there will be no sightings for a day, then another swarm of UFOs.
The first 5 or so days of the game I get one or two UFOs and my F-17's can catch and down the light scouts and scouts. But before the first month is even out I am discovering I need to have Mig-32's to be able to even catch up to UFOs. That's a pretty steep difficulty increase for just the first month (building Mig-32s on initial funding + any scrap gotten from ground missions).
I'm finding the difficulty has ramped up considerably in this version compared to V10.