It wasn't a showcase of professional players, just a way for showing what people wanted from Last Round. It was overall something for "casuals" matters, however it was anyway a nice thing from TK Europe.
There aren't really new things because wasn't a new build. It was just more a circumstance for making requests to see better some already known (casual) content in particular, nothing too much important from a gameplay matter (because who was testing it doesn't know that aspect of the game like the people on FSD).
@DoANoob Not sure, I wasn't able to see the stream if not for the very last minutes. By the way TK announced that it was archived and will be put on You Tube.