@LP_IBIZA has made a good post which covers a lot.
as of today, I believe all major clubs on the island will open this summer at some point - also the indoor ones. the 'when' and in which format will largely depend on what situation the balearics, spain as a whole and europe generally will be in in terms of vaccination, hospitalisation etc.
it's certainly not looking like an early start this season, but unless there are any major hiccups with the vaccine, by mid summer the situation should be vastly better. there are tons of options of how this all could play out and I am confident we will have much more of a real season this year. not a competely normal one just yet for sure, but definitely much better than 2020
Stivi , do you think a extended season is possible ? Weather should not be a issue : I was there end of october and you could do nearly everything
same as in mid of summer. Sometimes something more , because temperatures were more pleasant. Some wet and windy days , ok.