May 22nd 6 AM - May 23rd 6 AM MK will be open.
Not much announced, but if it is like last year there will be random DJ's at different places in the parks and there will probably be a special opening at 6 AM. I was there last year, and it seemed more of the special stuff started at night. A few dance parties with characters and a DJ and maybe even an extra parade. I am not sure on the parade, but I wouldn't be surprised if they through one in.
In fact my brother got into a dance battle with Pluto last year, until he tried to do something he couldn't do and fell HAHA