Obviously, there is no 100%, but they've already had some gameplay fixes (or attempts, Patch 2 specifically mentioned the Hag but maybe didn't fix everything).
So yes, there will certainly be gameplay fix patches.
When? When the stability isn't still an issue. Seemed pretty stable to me when I played early, but it's supporting a lot of platforms so who knows. My guess is you'll start seeing less stability and more gameplay changes in a couple weeks.