I'm actually quite positive about this move, although this came a little too late, in my opinion. Java EE has been criticised for not having MVC support, but it stayed opinionated and sticked with JSF. Apparently, MVC is actually a part of JAX-RS, so to speak. Not in the same spec though, it it will have integration points with JAX-RS. And there's also some sort of MVC support in Jersey already.
It is actually cool that it happened, just surprising that it took so long.