Is Sasuke going to get his arm back?
Sasuke will not get his arm back, he does not want it back. Sasuke’s missing arm is penance for his past crimes, punishment for the many lives he has destroyed and taken while on his path of darkness, and a reminder of why he is now on a mission of atonement.
Did Sasuke lost Rinnegan?
Not only did Naruto lose Kurama after the two of them had activated Baryon Mode to help keep up with the Otsutsuki, but Sasuke suddenly loss his Rinnegan when Momoshiki (who had awakened within Boruto’s body after the fight) caught him by surprise and stabbed it out.