1. It looks like countries don't leave xcom funding until the end of the month, so if you have the opportunity, use your satellite before the end of the month.
This is great. I've had so many countries leave xcom because I couldn't get satellites up fast enough - I eventually started over. I'll still have that issue but this will slow it down. I assume there's no "perfect game" where you can prevent all countries from dropping before the end.
Edit: They also changed the default QuickSave key from F12 to F10. Now I won't take a screenshot every time I quick save