There was this from the other AoW3 thread:
Thanks for the feedback - we’re hard at work on something new and exciting. Can’t tell much at this point, but can say we’ve gone 64 bit native.
That thread also talks about the feeling that they said it wasn’t AoW4, but no-one found any evidence there either. This is also pretty recent:
They’ve been working on it for two years:
Looking forward to seeing you there and showing you all that we’ve been working on for the last two years!