The spawns are fixed and the rotation remains non-functional.
The spawns will change occasionally from time to time without a set duration. I am not sure for the wiki but the Reborn bot will always be updated with new spawns, it may need some time after an update first though.
There were no changes regarding that, so yes you can still enter Guild Island that way.
That would be something for the box-rework which is already on the devs to-do list: https://pokemonrevolution.net/forum/topic/159019-dev-to-do-list/#comment-881115
Hey, we plan to add more regions in the future.
For now you can enjoy all of the custom content as in quests, daily activities, dungeons, seasonal events, storylines and much more