Yes they are coming: the World Mergers. Players going inactive means many servers are slowly dying out, which is bad news for active players. Luckily Kabam has come up with a solution: Merge a few relatively inactive worlds into one more active one. But this will of course have some consequences, especially for players playing in multiple worlds. I do not have all information yet, but Kabam has made an excellent post on the forum with a lot of useful information. For completeness I have copied the contents of that post below, and will amend any info I find that is not in there.
I urge all players, but especially those with multiple worlds to read it carefully and start preparing! Any questions? Feel free to ask in the comments and I’ll try to answer. The forums are of course also a good source for additional info, so check them out as well!
The following list are worlds that are confirmed to be merging with each other. Part of this information is taken from this website (hob-assist.com/), which also has timers running down showing when exactly each merge will take lace! Be sure to check them out! Merger list and Kabam info below the fold: