Do you have a proposed release date?
No, we don't, because we are doing a major rewrite ( the whole program from 32 to 64 bit ), and we cannot release a quick fix right now, because there's a lot of stuff that changed and lots of possible crashes to prevent.
Note that, it not really a GSX bug, it's really caused by a bug in the sim that doesn't update the fuel quantity unless you also change the weight on any of the payload stations so, we were forced to do that, otherwise fuel loading wouldn't work. Since we didn't want to play with actual payload stations ( those are numbered from 1 to N ), we just sent a dummy weight to a non-existent station ( station 0 ), and this seemed to work.
However, it seem ( because of your report ), we found another (different) bug, or more like unexpected side effect, that when changing station 0, all payload stations resets to default, so our fix would be just changing the weight ( not really changing it, but re-writing the same value it had before refueling ) of a station that actually exists, which seems to work better.