Yeah, during the climax of Act II in DA2, you'll meet a Warden wandering through (with your sibling, if they've been Wardened by Stroud). If Alistair was still a Warden, it's him; he's a bit nicer about apologizing how he can't help with the Qunari then Stroud is, too.
(Weirdly, if he romanced the HoF and she sacrificed herself, he also gives Hawke who he just meets a reminder of his long lost love? It's like 'Do you really want to do that, Ali? WE JUST MET!', but, well, whatever.)
So it makes sense for Alistair to be the Warden contact, as if he's a Warden, he and Hawke did meet, if briefly. Loghain really doesn't make so much sense... but I was glad to see him.
I like how it shows the character development of both Loghain and Alistair. Loghain has matured in to being extremely dedicated to the Wardens, even though they don't trust and like him. Alistair has matured in to being able to lead and comfortable with it even non-Kingly, and able to brush off words that would have hurt him severely. And depending on your playthrough (and luck) both have awesome conversations with Morrigan: Alistiar and Morrigan's can be really sweet and adorable, I thought.
One set up I really like is if you have both Alistair and fem!Hawke single and not tragically (IE, the HoF wasn't his lover and killed himself, or she didn't kill lover Anders or have lover Seb storm out on her), and you've gotten the 'mad about blood magic, but doesn't hate the Grey Wardens' Hawke (I'm not sure how to trigger that over the 'RAWRGH GREY WARDENS ARE AWFUL RAWRGH' one), they almost seem... kind of flirtatious. Not to the degree that would get Bioware angry 'HOW DARE IN A PLAYTHROUGH I DIDN'T ROMANCE HIM ALISTAIR SHOW ANY INTEREST IN SOMEONE ELSE' (like Darkspawn Chronicles prompted) letters, but still sort of ribbing and sweet and I was like 'If the world was nice, these two awesome people would become closer and eventually hook up and live happily ever after (until Ali's calling, anyway) without more crap in their lives'.
Then, you know, nightmare. Yeah. That dream ruined.
...Stroud is nice, though, as I don't feel as bad about sacrificing him (though he seems pretty cool). Loghain and Alistair, it's really hard to sacrifice, so... um... my poor Hawkes leave a lot of broken hearts behind.