Davis (13-5) has won both of her Invicta fights by submission, including avenging an earlier loss to Shayna Baszler with a 3rd round RNC stoppage. She's also defeated current UFC fighters Amanda Nunes and Julie Kedzie while still in Strikeforce.
Sexton (13-2) is a Cage Warriors veteran currently on a three fight winning streak. While she competes primarily at flyweight and is currently the #2 ranked women's 125er in the world (behind other new signing Sheila Gaff), the UFC only has the 135 lbs division for women's MMA. You may recall Sexton recently wrote a highly intriguing piece on her blog regarding Fallon Fox.
Ariel Helwani reports that this fight will air on the PPV main card.