That's great! I'm glad you're starting to get royalties!
I'm guessing that you're receiving royalties based off production from the Marcellus Shale, from horizontal wells. If that's the case, then yes, you are likely to receive royalties based off the rest of the wells that are going to be developed. However, anything can and will go wrong, so don't start spending it now. Wait 'til the checks clear the bank. Congrats!
For the benefit of those who don't know, would you be willing to give everybody an idea how much you're receiving in the way of royalties?