There is another RWBY game in development, but I'm not sure what genre it is.
Yeah, Cowboy Bebop and Firefly have somewhat similar settings, both are the kind of low-tech space western that I love. On that subject, now would be a good time to make a Cowboy Bebop game, with Netflix working on a live action adaptation of it that is expected to be very popular.
RWBY setting is kind of unique. There are steampunk elements for sure, like the semi-Victorian clothing styles of some characters, the airships, and Qrow's transforming clockwork sword/scythe. But there are also modern and modern-futuristic elements as well.
I am sure it's going to be mobile or arena based. RT doesn't like big stuff and even with outsourcing they don't have the funds for that (much of the company does run on a shoestring budget).
I second your motion on a Cowboy Bebop game. I loved that anime and will be watching the drama (by stealing the GFs Netflix account since I'm a Prime junkie and she leeches of that anyways).
I always thought RWBY was what you'd call "Noblepunk": Victorian setting with advanced tech (disguised as yet even more Victorian paraphernalia). On that train of thought, the two ideas I'd have for a game would involve a fairytale setting with the Gothic Victorian twist of RWBY and SINoALICE (hey, Yoko Taro did something right for once!) since that seems like the kind of edgy action (Bayonetta, Automata) that attracts younger crowds.
The other idea would be more Tarantino-esque games like WET. I loved that game.
In other news, we know Xbox doesn't have great performance in JP, but was anyone aware that both the Series X and S sold out there in a day and the Series X sold out in 20 minutes?