@Zeke I don't think they'll get bigger streamers than those with similar subs/follower counts than Maximillian Dood (around the 1m subs/followers range), but at the very least he's very likely to get a spot.
The usual Hololive ID and Nijisanji ID Vtubers are also likely (200k~350k subs), but it would be nice if they could also get one of Hololive EN Vtubers (which currently range between 900k and 2.5m subs).
I know you would like to see bigger streams than these, but, realistically speaking I think these are the biggest we can expect for NGS (though, don't underestimate the popularity of Hololive, one of the JP branch's vtubers was tied in 2nd for the most watched female streamer in the world during Q1 2021).
Well Maximilian_Dood did have some nice watching numbers when he did NGS CBT JP. Maybe it might be bigger this time because people will actually be able to understand the game.