Wildcards are a brand new way for your crew to get a limited time bonus! For example, a Wildcard may give your whole a crew 10% bonus RP for 4 hours. Remember that every crew member will get access to this bonus while it's active.
Wildcards are activated using tokens which are won by competing in Events. Once you've maxed out the donations to a Wildcard, any crew member can tap the "Activate" button to activate it for the entire crew. Make sure you communicate with your crew on crew chat before you activate the Wildcard so you have the most crew members online to take advantage!