And would FSDT be doing any smaller airports in the future, like KGSP or KCHS?
Not sure. We are releasing an small-ish airport in the future, which is Basel-Freibourg, and airport that might be considered "small" by American standards, but it's probably mid-size in European terms. But we chose it mainly because we already did the other two major airports in Switzerland, so it was fitting to add the 3rd one, since we are based in Switzerland as a company, after all...
But along the years, we seems to have noticed that sales are directly proportional to the importance and size of the airport, so it's the mega-hubs that seems to be preferred by users. This means we'll probably redo all our major hubs in the next years, to take advantage of 64 bit, and new graphic techniques that can be finally used by dropping backward compatibility with FSX and P3D V3 and earlier.
In a way, the jump from FSX/P3D 32 bit to 64 bit is even more significant than the one from FS9 to FSX. Back then, you were upgrading from a platform that had tons of add-ons, and none of them was capable to exhaust the system memory, so it's more important now, that everybody will move away from FSX as soon as possible.
We had KSDF ready for release for a while, and are spending these last weeks trying to optimize (by reduce complexity and giving FSX users the ability to turn off features), just because it runs perfectly under P3D V4 with all the stuff in and it's perfectly smooth, while in FSX we are struggling to reach 50-60% of the fps we get in P3D V4, and keep stuttering or OOMs at bay. It's just not fun anymore, and we are only glad it's the last one we'll ever release on FSX.