I would definately go in December. We are going in Dec. It will be my 2nd time in December and I am SO looking forward to it. It is so beautiful at DW in December and I didn't even make it to MK last time I was there (so I will definately be stopping there this time)
I know there are rumors that EE may have soft openings but all of the official word says that it will open Spring of 2006 so I think it would be pushing it for it to open in Feb.
I am hoping it will open before May because my DH's seasonal pass will expire in May and I know we want to both ride it and get another trip together (I go more often then him)