Not that much information yet, but looks cool so far

Link: http://www.insidethemagic.net/headlines/disneyland-announces-nightmare-before-christmas-merchandise-event-taking-over-more-than-just-the-haunted-mansion/

Edit: Found more information at : http://www.themainstreetmouse.com/2014/03/13/nightmare-before-christmas-trading-event-coming-to-disneyland/