Traditionally, he runs a very, very fast version of a traditional spread offense. Think something like those late 2000s-era Sam Bradford OU teams under Kevin Wilson, before they got back to running the air raid under Riley.
As far as spread concepts go, his attack is very vanilla, but it's super fast, and they obviously rep the hell out of it, so they execute the things they do at a very high level. He's basically like if you took Northwestern and snapped the ball every 8 seconds.
With that said, given the loss of starters across the board and the huge amounts of defensive attrition his team has seen, I have some big time suspicions that he'll try to run that same style Year 1 at WVU. I think he's way more likely to try to do something similar to the modern Northwestern model of slowing the game down to keep their defense fresh and win the game that way. Frankly, it's similar to what we were forced to do in 2017 and at times last year.
I am not convinced Brown's scheme/style is a sufficient competitive advantage to make WVU fearsome. While it may work at Troy against LSU, when you catch that team sleepwalking, it's just not particularly difficult for high level D1 teams to be prepared to play defense against a team that throws a lot of vanilla stuff at you really quickly. And even if it is, I'm not convinced he'll be given the time while there to develop his team sufficiently to fully implement his scheme/style, and they'll do a full reset back to some kind of super innovative offense.