Bitcoin Unlimited is not happening. It required 75% support from hashrate, and could only get approximately 45%.
Bitcoin Cash on the other hand will activate regardless of how much support it gets. The idea is that people who support larger blocks can be on their own chain and do what they want, while people who don't remain on the legacy chain (or perhaps a 2MB fork of SegWitx2, but not particularly large blocks). The economic majority will then decide which side is preferable.
So exchanges trading BTU futures are trading something that will never exist, just to rake in trading fees. It's basically a scam from the exchanges (mainly just Bitfinex), to be frank.
As for Bitcoin Cash's developer team, here's what it says on their website:
Unlike the previous situation in Bitcoin, there is no one single development team for Bitcoin Cash. There are now multiple independent teams of developers.
This decentralization of development (and decentralization of software implementations) is a much needed and important step forward.