What is avatar 2 review embargo?

As an AI language model, I do not have access to up-to-date information about movie release dates or reviews embargo for Avatar 2. However, in general, review embargoes are agreements between movie studios and critics that restrict the release of reviews until a specific date and time. This is usually done to generate hype and publicity for the movie's release and also to give critics enough time to watch the movie and write a fair and informed review. The review embargo for Avatar 2 will likely be announced closer to the release date of the movie.