Your action is required to support the candidate, see the story above.
I have no idea what this means. Now what will it take for me to get my Byteball wallet in fully working mode after new witnesses will be appointed?
You didn't read the story I guess. We don't appoint witnesses, it's up to you to pick them. Rogier is the first candidate, more will follow. The Byteball network belongs to the users, they decide who they want to be their witnesses. In the startup phase Tony had to run all 12 because we didn't have any candidates yet. So this is a big deal, it's step 1 in the community taking ownership over the platform, also known as decentralization. I could post here how you can change your witness list but blindly changing it without checking out the candidate is worse than leaving the switch on auto-update from hub. So I suggest you read the article and make an informed decision yourself.
I remember that originally the plan was to have also very high profile witnesses like institutions etc. Any clue on wether the team is approaching also some entity of such high profile?
For high profile entity the project is not yet attractive enough.
Furthermore: A high profile entity enjoys a high public reputation which he would not want to see endangered by a dubious project.
Dubios becomes bite ball just in case a free, uncensored global trade in goods develops. The latter is certainly not in the sense of state power structures.
Therefore only one thing makes sense: To route the witnesses, who themselves are anonymous and secret, via TOR/I2P.
If this is not considered one has to ask oneself which sense a currency should have like bite ball.