“This moron is giving me everything.”
Loki is not this careless with words; he has a “silver tongue”; he is the God of mischief (I’m talking strictly in the Marvel!film universe here, btw.)
If he let a secret “slip”, I’m quite certain he meant to do so.
Everything he says, every lie he tells; they always come so easily to him. They sound like he’s rehearsed them a million times in his mind, just within the split second it took for him to come up with them.
He “lets” this vital information “slip” (in my opinion) to lead the do-gooding Avengers on; allowing him to escape and let his* army into Midgard; even to loose that final fight, because he is Loki, and his prize is much more valuable than just ruling over the people of Midgard**.
He’s tied up, muzzled and lead by Thor to Asgard at the end of the film, a supposed prisoner, but what none of the Avengers know is that he wants to return there! He’s had a lot of time to fully turn himself against his father (and possibly his brother..?) and I suspect he’s also under the ruling of someone, much higher up that the leader of the Chitauri…
We’ll see, anyway, but that’s basically my headcanon for the next Loki/Avengers film!
*I think the army was provided by who-ever was orchestrating the whole thing; using Loki as a messenger to the people of Asgard and the Chitauri as canon-fodder to try and prove a point to the Avengers on Earth that they are willing to send troops in and cause mass-destruction, even if they won’t win (or something similar!? We all know how highly bad-guys value their army troops! It’s not like they always, always out number the good-guy’s forces by at least 10 times and still always loose, right?)…
**Seriously, did no-one else think that “You were made to be ruled.” was just… Well, just a bit naff? Like, it didn’t seem like enough motivation. Looking into the psychology of Loki, you can pretty much tell he has certain issues but I don’t think ruling a planet as measly as Midgard would be enough for him. He’s already shown how little he thinks of humans by killing so many of them in his attacks (the infamous, “He killed 80 people in 2 days.” quote backs this up), and always berats them/insulting the ones Thor loves. So, then, why would he want to rule a race of “ants” (who would have no quarrel with his boot!) when he could “collaborate”*** with another villain and lord over his equals (or as close as you could get to his “equal”; he obviously doesn’t think he has any. He’s both a self-assured megalomaniac and a broken man; a God who no-one loves and who loves no-one, not fully… It must be a difficult place for him to be, but I certainly hope they expand on it in the next film because, just, Loki feels…)
***I also think Loki might be clever enough to double-bluff even the higher-up villain… I just haven’t figured out how that might work… Yet…
ps Sorry if tagging direct names into responses is frowned upon; I’m not so good with Tumblr… :-/ (I’ll take it off if it’s inappropriate!!)