The blog does mention they are targeting One, Series and PC. It also mentions the modes, weapons and features availabe, its not yet a PvP test
“ The number of Insiders being invited, and the criteria by which these Insiders are selected, will vary given the specific scope and goals for a flight. For the tech preview, we have concurrency targets tied to our overall goals that will inform how many total Insiders should be invited. Within that pool of players, our first priority will be ensuring we have a broad distribution of platforms (Xbox One, Xbox Series X|S, and different PC configurations)”


