Ashly Burch, the voice actress who voiced Tiny Tina in Borderlands to will return to Borderlands 3. Burchs return was confirmed on Twitter by Randy Pitchford. However, we dont know whether the rest of the voice actor will return, but they will reveal more information as time goes by.
Source: N4G PC Ashly Burch returns as Tiny Tina in Borderlands 3