There are no definitive long term plans beyond BF2, but things are being tried out and discussed. It is not impossible that one day there is an FH3 (maybe as a commercial game), but it is not the safest bet you can make.
Short term we are in the process of eliminating last bugs from the Eastern Front content. Once this is done, we will release Forgotten Hope 2.5 through the launcher you all already have on your PC. We want this release to be as professional and bug free as possible, which is why this last polishing stage is taking longer than expected. Beyond 2.5 there are several new maps already in production (including new Russian, German and Finnish content not in 2.5), as well as plans for new fixes etc, which we hope we will be able to release relatively shortly after 2.5, no promises though.
As for what we get out of this: The satisfaction one gets out of a creative hobby and seeing people enjoy something you worked on. Or, if that doesn't work, the tears of people who think our tanks are coded wrong