Let us say that the mighty Thor is engaged in battle 'gainst a villian most foul. Let us say that said villian is able to disarm Thor, causing Mjolnir to fall to the ground. Let us say that the fight carries the hammerless Thor some distance from Mjolnir. Can Thor cause Mjolnir to return to his hand? I'm envisioning Luke Skywalker using the force to cause his lightsaber to return to his hand. Can Thor do it with Mjolnir?
I want to say he can't, because there were probably times in the 60's when he was pressed by the 60 second rule and needed to get to Mjolnir fast, and he couldn't just call it. But it seems like he SHOULD be able to call it to him. Anyone got any scans to that effect?
I think the current trend is that Thor can summon the hammer. I can't recall any moment recently in the comics, but it happens pretty regularly in AEMH cartoon. I think that's a good indicator on how Marvel currently views the relationship between Thor and Mjolnir.
With any luck, they'll define a few of these little things with all the Thor hype and they'll stick for a few years (at least).