Vulp,
Evidenced by the many threads with many posts (including the one I linked for you in your bug reports thread), many others are having similar issues as you are.
As for ETA’s Bliz typically doesn’t give them. For example, they have already tried a fix which didn’t work. Had they given an ETA for that, it would have been for nothing. The vast majority of the time they announce a potential fix at the moment it’s released.
Also evidenced by the posts Bliz has made, the issues are on Bliz’s side so we will have to wait until they resolve them. I did see one community post stating that tabbing out during the authentication screen helped them.