Thor #4 is out this week and here's a quick spoiler that shows someone no one would expect to be now be worthy. Worthy enough to hold Mjölnir that is, the most famous hammer in all 9 realms.
Spoilers below, so if you don't like spoilers, why did you click on the article to begin with?
What do you think? Is Loki worthy now while Thor is a Herald of Galactus?
You can still pick up Thor #4 online.