They just got renewed for a third season, but as with all tv shows, there is the strike (though this show finished shooting pre-strike, so bully for them!). Also, they didn't know they'd get renewed when they finished the second season.

Rita's ghastly mother asked Lila point blank what she was recovering from and Lila said "methadon", but that doesn't have to be the truth, of course. In any case, yes, I think there will probably be a punchline there.

The lunch scene with Deb & Lundy was when I thought, as mentioned, wait, there could be actually a semi-happy ending for those two instead of an ending in tears. They care about each other and actually talk about their problems, which makes them more functional than most tv couples!