Also, we know that Momoshiki Ōtsutsuki will have Rinnegan as well, with which he can absorb all ninjutsu and then use the same absorbed ninjutsu against the opponent. And since it appears Urashiki Otsutsuki is the most powerful Otsutsuki till now, then he might have both Byakugan and Rinnegan abilities.
Now, coming to the newly revealed abilities of Urashiki Otsutsuki during the most recent episode of Boruto: Naruto Next Generations. In this episode, Urashiki Otsutsuki was seen confronting Toneri Ōtsutsuki and reveals that he is from the main family of Ōtsutsuki clan, which came as a surprise for Toneri as he thought they were long gone. Then Urashiki Otsutsuki accused Toneri of betraying the Otsutsuki clan and punished him.