I won't lie, I'm liking it. Future Trunks is my favorite character, and teen Mai got me hard. Killing off Bulma and Mai was kind of too much though. I wanted to see more of future Bulma, she's so cool.
They will probably revive them later with the dragon balls anyway, but still.
Overall the episode was great, one of the best from Super so far, by far. Let's hope they won't fuck Black up, the idea of a "black goku" seems like some Shadow the hedgehog bullshit, but he could also end up being a pretty cool villain.
I still don't like the Trunks redesign though, I don't like his more spiky/messy hair, I prefer his more correct, tidy haircut, but I guess he didn't have time to take care about that.