What was the point of this announcement? The way this studio communicates is aggravating.
To let you know that saves won't be compatible, so you can make decisions about which branch to play on, whether or not you'll start a new playthrough, etc. Makes sense to me.
I'd also like more details, but the reality is probably that they themselves just don't know yet. Game development is a messy process, things can and do go wrong at the last minute, and there's no point in releasing a patch that's going to break a bunch of things.
It does make sense, but without time frame it just leaves everyone hanging