It certainly looks that way, it's not a natural movement one might make while getting in the car either.
Either it's a mistake or intentional, hopefully if intentional the next sheds some light on it via dialogue between Gus and Mike to the tune of "Did you deal with him, Jesse?" or something.
If they were going to kill him was their only intention for him the grand plan with the Cartel?
What about the ramifications with Walt, could they risk it? They do not have another cook?
Some interesting discussion on it here with some frames.
http://forumserver.twoplustwo.com/159/ootv/breaking-bad-season-4-a-1060273/index278.html
In one of those frames, Mike has the gun in Jesse's direction but isn't looking at him. I just think it was just Mike getting in the car, there doesn't seem to be a valid reason yet for Mike to end Jesse.
