WWE aired a commercial on Fox 2 Detroit during Smackdown to announce matches for the show on 12/27/19 at Little Caesars Arena. These will probably be the dark matches.
Roman Reigns vs. Baron Corbin
Braun Strowman vs. Shinsuke Nakamura and Sami Zayn in a 2 on 1 match
The Fiend vs. Daniel Bryan
Tickets are available here: https://www1.ticketmaster.com/wwe-friday-night-smackdown-detroit-michigan-12-27-2019/event/080056F6CB2E4418