Zero, according to Gomez last week.
According to what he said, Spring/Summer 2019 is a good estimate of what we're looking at for the GB update now, despite a SotU post a YEAR ago saying GB would be updated right after Star Wars. That didn't happen, because, well, Gomez. NOTHING he says can be believed. Nothing. He's a terrible estimator or a serial liar, but the result is the same. Massively missed deadlines and games still shipping very incomplete.
A GOOD product manager (i.e. non-Gomez) would make a small bugfix release to fix the worst bugs and promise a bigger release to come. The many straightforward bugs in the game could be fixed in ONE LONG DAY (or if I'm being REALLY generous TWO days), then give it to some trusted Stern customers to bugtest and it could be out in 2-3 weeks with little disruption of stern's development lines. This would satisfy most people and at least show some good faith for one of their best-selling games. But no, that's not Stern. Gomez keeps insisting on trying to salvage his dumpster fire games instead of building on the successes.