Oh, I know there was a potion involved with Lorelei, sorry I worded wrong there I guess. I doubt they'd have a potion involved, just Thor trying to save someone he cares about from Malekith and Kurse since that was what happened (sort of) in the comic story. Although they dont usually draw so closely from the comic book storylines, it would lose all the surprise and suspense if they did since people would have already read that story! They may use some elements/themes from past stories though. I do agree having Loki or someone use a potion like that in the film would seem cheesy, especially when he already knows of Jane as someone Thor is interested in, who is vulnerable. Could be Malekith is looking to work with Loki to get his vengeance, and Loki spills the beans about Jane in the hopes Malekith will help him escape his punishment.
I think "vengeful" could be what leads him to kidnapping whoever (Jane, Sif, Frigga, Loki) in order to get at Thor, if Thor or Odin is who he is feeling vengeful towards. Vengeful is Malekith's motivation, not the plot that he uses to get that vengeance. My feeling is probably vengeful towards Thor, and that is why he does whatever he does, to get back at Thor. (although could easily be Odin again)
On Jane as Thor's love interest, well, *sigh* I dont want to get people mad, but here I go (Sorry!) I really feel like she's served her purpose, making Thor fall in love with Earth and mortals. I mean can you really see them together when she's 80 and he's still young? I can't see this relationship going into happily ever after territory, not at all. And that may be a big part of whatever personal struggles Thor has to deal with. Realizing that being in a relationship with Jane puts her in an insane amount of danger since she is mortal, and it may be best to let her live her mortal life, than to cling to an idea of one with him that is doomed from the start. That's not going to change unless they add some cheesy thing like Odin makes her an Asgardian (a tiny one at that!) or Thor chooses to become a mortal and be with Jane (which would then put an end to the Thor movies and his involvement with Avengers). I do think done right, her dying could be very poignant and important to Thor's character motivation in future films. Sort of make him that much more determined to save Earth, for Jane. And perhaps he has trouble finding love again after that, because he is now afraid that anyone he falls for will be in grave danger all the time as well. Honestly, I'd rather see him develop a relationship with Sif, and concentrate the Thor films more on the other worlds, and then have him return to Earth more when the Avengers films take place. JMO. Again, sorry Thor-Jane fans, dont mean to bash.
