Generally speaking Disney Visa cardholders and Disney Annual Passholders get early registration for runDisney races. The rumor, which is not confirmed, is that early registration for Princess Half Weekend will begin June 6th. Again this is a rumor, but I have heard it several places, so if you are interested I would check your annual passholder or Disney Visa cardholder websites tomorrow. If you are planning to run the Glass Slipper Challenge or the 10k I would register as early as you can since these will most likely sell out very quickly.
Are you planning to register early?