The manner in which Sri Shirdi Sai Baba indicated His return as Sri Sathya Sai Baba was so subtle and cryptic that even to this day there are people who contest whether the two Avatars are the same. Sri Sathya Sai Baba made multiple references to Prema Sai Baba, the next Avatar, in multiple discourses and private interactions.
Today, that has led to multiple theories and stories about the Advent of Prema Sai Baba. It has also led to multiple beings proclaiming themselves to be 'Prema Sai Baba'. Here is a collection of everything about Prema Sai Baba authentically recorded in Sri Sathya Sai Literature. Each one can draw his/her own conclusions based in these.
You can see this Video in Russian as well at - https://www.youtube.com/watch?v=g1U9C4Rsmjg