Just noticed while watching a stream that, similar to tanya, there are actually a few differences between his borrowed move set and the one seen in MKX
Just like how Tanya has her projectile, and a few moves of her own to go along with kitana's placeholder moves, Rain's bubble seems to work differently, in the sense that he can move and use other specials and normals while the opponent is in the bubble.
I also noticed the CPU using one new string that wasnt present in MK9, looked like a couple quick jabs, but not like his 1 1 string in MK9
This gives me some hope for Rain as future DLC despite what Ed has said in the past!