Please rest assured that progress is continuing. I know this because I get "pre-release"s to do the proofreading as GTS is making progress, and I am discussing the process with him regularly
The next group of scenes makes up a big complex set-piece that leads into the climax of chapter 4. He's up to the 6th "pre-release version" since the last public release (which roughly corresponds to that many subscene's so far).
Each of the several sub-parts that make up the next release is being worked on one after another. Along the way there have been a few technical hiccups (the chosen werewolf model being basically incompatible with male genital geografts one of these that burned up a bunch of time).
All up, it's just a big chunk of work that takes time to get through and does not make story sense to release in pieces. Please be patient, I'm sure you'll enjoy it when it arrives - GTS has been consistent in delivering update-after-update for more than 2 years now.