With Marvel furiously planning and plotting movies a good five or six years ahead at the moment, it's no surprise that some of its slots are set to be filled up with sequels. Whilst Iron Man 3 is likely to be the end of that particular franchise for a while, it'd been assumed that the plan was to get Captain America and Thor to trilogy status as well.
Anthony Hopkins had already revealed that he'd been keen to make Thor 3, but it was down to Natalie Portman at Disney's D23 convention over the weekend to all but confirm it.
When specifically asked about Hopkins' keenness for another movie, Portman said that "Yeah, well I think they are going to make a Thor 3, so I think Anthony will be pleased". Her words may be slightly vague, but given the veil of secrecy that generally surrounds Marvel announcements, it's surprising that it's being talked about at all. Our guess is that Thor 3 conversations have started already, and unless Thor: The Dark World flops (unlikely), it'll be full steam ahead.
The full interview with Portman is at E! Online, here.
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I'm still convinced her character will be killed off, given her reluctance to come back for this one. "Anthony will be pleased", lol. Might be reading that as more sarcastic than it was meant to be.