The kiss wasn't really sensual, but it (along with the rest of the images) strongly conveyed the sense that Mako wanted to go out with Ryuko for real. (
Not just as friends[/url]. I mean Mako's always been "friendly" with Ryuko (she's groped her boobs and ogled her in the past) but that always felt comic relief-ish. It feels like there's a distinct difference in Mako's interaction this time... I didn't really get the sense that they wanted to just hang out. (Otherwise, what would be the point of announcing it?). It's also worth noting that during credits, Ryuko is shown anxiously waiting for her.
Maybe things might change, but it's hard to deny that Mako has romantic feelings for Ryuko and vice versa.