It might be too late to make any significant finding... if there was any attempt of cover up, China had plenty of time to do it.
Either way, I wonder what kind of research they will do.
Edit: just to make this clear, yes I don't trust China and I think they tried to take advantage of this situation.
Zerohedge yesterday had an article (referencing mainstream sources) about multiple purges of Covid-related public data in China.
I predict the clueless WHO jokers will be as successful as the UN guys who went in to investigate Uighur "education" centers.