What I like is the words 'posible spoiler' in the topic title when this is just a fan discuission. A spoiler reveals something that is or may happen. I'd get you the dictonary defination, but thats not me.
If frost did come back she would either:
A) go after Subby
B) be crazy
C) Realise her mistake
D) Be exactly the same as before.
E) I ran out of possiblities... :?
I seriously doubt the robot thing would ever be brought in. The Lin.K are under the control of Subby now as he is the grandmaster. So first he would have to go bad and want to make robots. Then you'd see more robots.