Everyone's been worried about whether Thor is going to get his hammmer back. That seems like a foregone conclusion fast approaching (fingers crossed.) I'm more curious if he'll be getting his arm back. It's one thing for him to change his view of things and be worthy of Mjonir again. I wonder how they plan on justifying growing the appendage back or if they will at all.
---the late great Donald Blake
Given that the power of THOR shape shifts the recipient from a normal human into the God of Thunder, it is possible that once he regains the hammer it will regenerate his arm.