According to the official Winter Weekends page on BGW's website, thirteen rides will be open, including three roller coasters and Forest of Fun. Also, there will be unique animals not normally seen at the park and a firework show on Saturdays before the park closes. The event will run from the 15th to the 24th of this month. I am attaching the link here for anyone interested in learning more about the event or getting tickets:
buschgardens.com
Winter Weekends | Busch Gardens Williamsburg
Celebrate the new year at a winterland of fun... where rides, lights and animals excite!