Whether or not these realms will directly resemble the Magiclands from the comics remains to be seen, although the presence of these crocodile men and the prospect of bringing the anthropomorphic tiger Tawky Tawny, a longtime member of the Shazam mythos (who was subtly referenced in Shazam! via a stuffed tiger toy), suggest that the Wildlands could at least appear.
Aside from visits to the Rock of Eternity, Shazam! only took place on Earth, but these doorways and Mister Mind aspiring for multi-dimensional domination foreshadow that Shazam! 2 will likely have the Shazam family visiting other magical realms.