My guess is that the delisting will complete very close to announced major news. Either the delisting will happen and then news follow very shortly (avoiding any trading reactions).
Alternative, the news will be announced first and then the delisting will be performed close thereafter. However, this will make a short window for market reactions, and a new buyer/investor would not like that.
The voting for delisting was just preparations for the upcoming event, to facilitate for fast delisting when other awaiting processes are finally cleared out.