As you know, Microsoft are soon to release a patch for FS9. This will bring you up to version 9.1
If you use FSUIPC by the skilled Pete Dowson, make sure to visit his site to download version 3.4x of FSUIPC so that your add-ons continue to work.
Also, if you have ActiveCamera installed, you will also need an update. I am not certain if this is ready yet, but when I get an update I will be sure to post it.