it looks like here Ianto seems to be the one who instigates the kiss: Jack is sitting (?) at the table maybe and Ianto has to lean down to kiss him (Ianto seems to be in charge of the kiss.) - YAY for dom!Ianto.
This is what JB said about the scene: "In one of the early episodes of the second series, Ianto has a meltdown in the Hub one night, for reasons far too complicated to go into here, but if you've seen it, you'll know. I have to admit it's one of my favourite episodes to date. Anyway, while Jack comforts Ianto, he shifts from innocent consolation to a full-on, passionate embrace and kiss."
I believe that this might be THE SCENE. There's def "a meltdown" (Ianto's out of it murmuring: "I'm a monster"), he's being hugged to be comforted and Jack is the one who does the comforting (You can see it's Jack's coat in the picture). So I guess that the "full-on, passionate embrace and the kiss" will follow up THIS hug. Which would mean that Jack would be wearing his coat while kissing Ianto, both of them possibly standing. Which is a great theory, because that would mean there's def more than one Jack/Ianto kiss awaiting us in series 2.
But it's still only a theory.