Maybe Faye is going soft on him.
I think you're right - the look on her face in the last panel, despite the smugly snide comment, is downright beatific! I think she's starting to find Angus endearing, especially in his current state of confusion... the fact that he's actually trying to be considerate and give a damn, that he's so confused as to do so inappropriately (at work), and yet is still together enough to put out an alternative sass line that she can appreciate...
Yeah, it's not love yet, but it's certainly creeping in that direction!
Although, we know Jeph. It'll be 2013 before they declare their undying love and finally move in together, leaving the other apartment to Marten and a pregnant Dora, and forcing Marigold to move in with Hanners. No, I'm not shipping those two, it's more like the odd couple (although Momo and Winslow... naaah, never mind).