Despite Covid, Garry Kasparov will make his annual “un-retirement”, in an on-line Fischer Random tournament on September 11-13. He is by far the lowest rated in the field of ten super-GMs.
The St. Louis Chess Club is organizing. Magnus Carlsen will play in it as well as in rapid and blitz tournaments later that week.
So, is any “opening theory” developing in Fischer Random?
I suppose there is room for one to author an opening book for each of the possible opening setups. Lots of work to be done, eh? 
I’d be curious to know if there’s a Fritz opening book for Fischer Random…