I think Triple H is still involved with NXT in the same way he was. There were rumours about Vince taking over but they were quashed.
It seems, for now at least, the "re-branding" is pretty much just a change in colour scheme.
However, it does seem like Vince will be involved in the future, either directly or by proxy, and Nick Khan has basically confirmed they're no longer interested in signing actual wrestlers, and will instead be looking at athletes/actors that they can train in the WWE style so the majority of talent is developed in-house.
From what I've read, people are expecting noticeable changes to NXT's style in around 6 months as they phase out the wrestlers with independent backgrounds and replace them with performance centre graduates.