We know that New Sulan is more than a visual makeover, as it will contain new mechanics and systems; we just don’t know what any of those mechanics or systems are. However, we’re also told that it will probably not be identical to the Chinese release of the content, which adds further mystery. But it’s new things for PvE players as well, so there’s plenty of reason to get excited even if you’re not yet altogether certain what you’re getting excited about.
Source: Official Site