When the City of Heroes Zombie Apocalypse hit the Test Server some days ago, speculation ran wild as to why the developers were testing out a Halloween event so early in the year. Could it be that they would soon need the Test Server for Issue 13?
It was an exciting possibility, but it's not to be. City of Heroes developer Back Alley Brawler, otherwise known as Christopher Bruce, has provided a series of illuminating posts that explain what's actually going on.
A revamped version of the Winter Event, along with 'other surprises', still remain to be tested for the current Issue before Issue 13 will show up. As far as timing goes, it's possible that Issue 13 may not be ready to go live by the time the Winter Event needs to happen, which is why the events are being tested for the current Issue.