Agree with the Forma 2, Kobo cannot count to 3 anyway, just like Valve (the half-life game developer
).
Jokes aside, by the issues with the Sage, a 2E update would be expected (better battery, buttons etc), though not sure about a Libra update, what kind of new features they could add that justifies a new device. We already have USB-C, a crisp screen, good battery life, audiobook support. Maybe a Libra with a Mobius screen? But that's just not enough by itself.
I do really hope for a Forma 2 though. For me, the first Forma has the best ereader design ever made, despite I don't like the flush screen in ebook readers in general.