The game recognizes the new content and switches to the resources of the new Campaign, but it is not yet clear whether this is due to a specific build of "Crossworlds." If so, then fans might want to buy it for new user-created Campaigns, but the developers promised that Campaigns could be created for "Legend of the Knight." Of course, it is unlikely that this undocumented feature has been carried over from the first part, but who knows.
Attention, a bright spot! The editor has finally appeared. Rumors that the developers would soon release an editor have been circulating since "The Princess," but, unfortunately, it only appeared now. Whether it was worth waiting so long is another question, but now interest in the game has significantly decreased.
In addition to the editor, the disc contains a 2.5 GB texture pack, which expands to 14 GB when unpacked, as well as a detailed guide on creating full-fledged Campaigns.
In conclusion, if you are a player and wanted to enjoy new adventures, there is essentially nothing interesting for you here. However, if you are going to create maps/Campaigns and actively participate in the development of modifications, then it is still worth buying the edition.
P.S. The developers are, of course, doing a good job; they have once again managed to sell the same thing (let's also remember the "King's Ransom 2 - Reloaded" edition). No, their games are still beautiful and interesting, but, as they say, an unpleasant trend is emerging.