This video from Cartoon UNIVERSE (Not NETWORK) say the show is now on hiatus again... and we are NOT getting Lion 4 on Next Thursday.
https://m.youtube.com/watch?v=5JkrkbfjN1E
This is from Cartoon Universe's description of this video
"It was rumored that Steven Universe would be returning March 23rd with Lion 4: Alternate Ending, but sadly, it seems like that might not be the case. Thanks to @BecksterCorgiMT pointing this out on Twitter, according to Zap2it, Steven Universe will only be airing 3 more times this month and none of the episodes are new ones. When can we expect Steven to return?"
It's make sense of why we will NOT getting Lion 4: Alternate Ending because they want save that episode for Sixth StevenBomb
I going to bet that we will getting Sixth StevenBomb along with Lion 4: Alternate Ending around Summer 2017 (Between June or July) and it going to end the season before we are going to Season 5 which is speculation to be the FINAL season of the show!