@Lilliwyt
My money is on, yuri-wise, a meaningfully open ending. I suspect that part of the last phase of the series will be a general clarification of people's real preferences regarding Tomoko and vice-versa. If the yuri issue comes up, it would have something to do with a possible future for each girl. Yuri, Hina, Asuka, and Yuu (and hopefully Megumi) will be in very defined places. Komi will be in prison for imprisoning Tomoki in a dungeon. Uchi...I don't want to think about that.
I do think yuri will emerge as a possibility with someone, most likely Yuri and Asuka. The fact is that whichever team they play on, and drama or comedy aside, most people don't start having sex with each other that early, and this is an oddly realistic series along those lines. Networks around college or marriage or post-HS employment are where most people start that.