So, I've spoken to my hotel and also the Forest Department. I'm not sure I got through to the right person at the Forest Department, so they didn't provide much information. However, my hotel said they had checked with local officials and that advance booking were still valid and the park was open. We have advance booking so we're apparently still fine. There are apparently 1500 or so delegates descending on Jaipur for the 'World Wilderness Congress' and it sounds like the government are trying to hold as many of the remaining places as possible.
Our fingers are crossed that all goes smoothly, but we're also happy to have a few days downtime if things don't materialise.