Hi there,
There is always a chance that regulatory approvals delay the deal or prevent it from happening. That said, I haven't really seen anything indicating that there are any real issues. Usually, you'll hear fairly soon after if there are potential issues, but havne't come across anything yet.
That doesn't mean something won't come up during the regulatory review process. Today, NVEI is only trading at a 5% discount to the buyout price which is an indication the markets believe the deal will go through. If the markets felt that there was higher risk, you'd likely see it trading at a higher discount to the buyout price. It is a good barometer for risk associated with the chance of a deal closing.
Mat