The National Park administrator for Haleakala National Park has suspended bike rides inside the park and canceled the bike tour permits of all bike ride companies for operation inside the park boundaries. Nobody knows when this temporary suspension will be lifted.
However, you can still do a bike ride down the mountain. The ride will start at the park boundary. Some of the tour companies offer a van to the summit, and then back down to the entrance for your bike ride, so you can still do sunrise at the summit as part of your day. The bike companies that didn't have that type of permit (or an arrangement with another company) can't offer that van ride to the summit.
Maui Downhill is one of the companies that's still operating these tours.
-David