According to PW Sheet, Neville has been released from his contract with WWE. We are able to confirm this report, with Ryan and his team staying on top of this story.
What we can tell is that Triple H made an effort to make Neville his face of the NXT UK Brand. About a month looking back, it seemed to be a possibility with his contract being froze but him wanting to be out of it.
At this time we are not sure what happened between the two sides, however, we will continue to follow this story as more updates come out.