Well the Halloween hard-ticket (seperate admission) event at Disney's California Adventure is no longer called "Mickey's Halloween Treat."
The event is now called "Mickey's Trick-or-Treat Party". Same premise, new name.
More information can be found at //http://www.disneyland.com under "Halloween Time", and as an added bonus, here's the new logo:
[attachment=0:56tjesov]MickeysTrick-Or-TreatLogo.jpg[/attachment:56tjesov]