Hi Robyn , its just a bit smaller/narrower than the nevada M , being 4 berth not 5,I think its a special edition in green rather than moccha colour ., and being a new one this year may not have any reviews yet . nevada M has excellent reviews.
We have bought the Nevada 3 which is a bit smaller than the Nevada 4, and we use it as a weekender. I think both the Nevada 3 and 4 are limited editions. We went camping this weekend and someone had the Nevada 4 and it looked a really good tent!! We love our Nevada 3 though