Just a note to all the people who say this mod is disappointing or who rail that it is unfinished or taking to long to update. You should know that Twilight Forest was one of the first mods for Minecraft. Not first big mods, or first for the release version.... one of the first mods. Full stop. It's been around for almost a decade, and I sincerely doubt it's dying here.
Might be that Benimatic is trying to figure out which version to update to, or having to rework some of what he did for 1.8 to 1.8.9 or 1.9.4. Might also be that he's got some personal stuff to deal with. It might be that he'll hand it off to someone else to update. But Twilight Forest is an institution for Minecraft, and I wouldn't rule it out just yet.
As for versions, I'd love to see it for 1.8.9, 1.9.4 and 1.10.2, but if it just goes straight to 1.10.2 that is probably safe. its the last version before 1.11 and it's looking like Vanilla updates post 1.9 aren't making big backend changes, meaning updating mods will be relatively simple.