Any words on new buildings?

[Kerridoc]

Unclear. Re-reading the transcript, this is the cleanest statement:

with Hero Academy, a surplus of heroes can be converted into new ones. Let’s see how that rolls out. I’m hoping that the Hero Academy would have something where some heroes could be traded or converted into new ones, but that needs to be tested in beta.

There’s been speculation that there could be a like-gets-like principle: if you convert a Classic legendary, you get a Classic; if you convert a Season 2, you a Season 2; etc. But these are all just speculation without foundation.