Beta 2 included new emoji that are part of the Unicode 12 release. Apple previewed these back in July.
Other updates in iOS 13.2 beta 2 included a new Delete option when force touching or holding an app icon, a new skin tone picker for emoji, the ability to delete Siri & Dictation history, a toggle to opt out of sharing your audio recordings with Apple, and the ability to change resolution and frame rate of video recordings right from the Camera app.
We'll let you know if anything new is spotted in the third beta. Developers can download the beta from the link below. Please follow iClarified on Twitter, Facebook, Google+, or RSS for updates.