Re: SUPER UBER SPOILERMANIA: The Ending... What Does It Mean?
I noticed it too and thought that it was Loki, but since there was no reveal right away I thought "oh maybe not then". Same with the scene with Loki 'dying' earlier. I kept expecting the body to disappear and Loki to step out and laugh at Thor for falling for the same trick again and again, but they kept with it and I seriously thought that he could have been dead right up until the reveal at the end.
Though as for what the reveal means I didn't quite know what to think myself at first, but going from what I've heard in interviews it seems they may be intent on having Loki pose as Odin in the long term and rule Asgard having let Thor leave for earth. Before I heard that I half thought Loki was just messing with Thor for the fun of it.