According to what's listed on their websites, VF and Michigan's Adventure passes are good for admission into GL for the '05 season. There was a small advertisement for '05 GL passes this weekend at GL's Oktoberfest on the event's flyer/ park map, but it said to check with guest services for details (I did not notice the advertisement until I got home so was unable to look into it).
"Theme Park Critic Extreme" 