Well, I always consider the comparison between Apex and Fortnite like one between a downhill bike and a triathlon bike: both vehicles are of the same category, functioning by the same principles, but belong to different disciplines and core audiences. Fortnite has different core pillars, its style and difficulty appeal to a broader, more casual, younger audience, there's more building and exploration going on, so it really needs its world to change. Apex, on the other hand, is more suitable for hardcore gamers, that have played shooters before and want to become more competitive, improve their skills, develop team tactics.
Kings Canyon is already a pretty comprehensive map, with loot and areas that pretty much cover all sorts of combat styles and perfectly sized for a 10-15 minute match. This fine balancing can be broken easily if changes are rushed. Adding more loot areas or altering the looks of the environment won't hurt, but I doubt these will add significant value to the gameplay. Some new interactive objects would be cool as well, especially if useful for developing tactics.
A new map would have more impact than modifying the current, but I wouldn't expect something of this scale so soon. Next year, perhaps, with additional game modes.
