is V3.2 the final version? Or is it stated that there'll be more?
Pretty sure they are finished with it now. They did like mini-DLC for it. And the final version is 3.10.
The DLC contains a couple of special endings and an outfit for Nepgear, thats about it. They are doing another game now. I could be wrong but I think its going to be based on Noa from Blue Archive. A sequel to the Nepgear game might be on the backburner till they release this one.
I think they are doing a Nepgear Maid in Korean/Chinese but thats about it. No English because they just dont have the resources for it.
As for timescale on the next release I really dont know. They want to stick to small FanFic style games. Nepgear Maid wasnt really big. If you did the right things at the right time in a certain order you could complete Nepgear Maid in about 45mins without skipping the text boxes.
Im guessing it takes about 6 - 7 months to make a game like that. Doing the map layouts, script, portraits, multiple routes etc. Then play-testing etc