The theme of the day is Firkin 5th Anniversary, so as you can probably infer (unless you've recently had a lobotomy), there will be a number of firkins getting tapped, along with some limited and special regular kegs.
One beer will be tapped each hour, on the hour, starting at noon and ending at 9pm. Plus, they may throw in some additional surprises throughout the day. Below is the list of all the confirmed beers. Some have tapping times that have already been announced, and for those that are still 'TBD', keep an eye on the Flying Saucer Twitter account where they will be releasing that information (I will also update here).
Perennial Imperial Milk Stout - 12pm
Mother's Lil Helper with blood orange and jalapenos - 1pm
Empyrean Chocolate & Lactose Infused Dark Side Vanilla Porter - 6pm
4 Hands Bona Fide Imperial Stout - 4pm
Evil Twin Ryan & The Beaster Bunny - TBD
Evil Twin Bikini Beer - 5pm
Founders Doom - 7pm
Widmer Kill Devil - 3pm
Green Flash Hop Odyssey Imperial Red Rye IPA - 2pm
Firestone Walker Double DBA - TBD