If anything, I expect simple 3D games will be available to create on Construct, something simple such as a 3D platformer like the Pandemonium games
Pandemonium 1 here
<img src="http://www.abandonware-paradise.fr/Gifs/Abandonware/Pandemonium.png">
But I don't expect there will be animated models anytime soon or ever for Construct 1 or 2, I hope you will still load non animated models to create a landscape for 3D maps that are not just cubes using 3D Box but the objects like player, enemy or item and everything else will be a sprite, am I asking too much? I've always wanted to create a 3D platformer but due to I have no knowledge of programming I can't create a 3D engine, let alone a basic 2D game with programming.
there will still be some animated things in 3D however like a door/floating platforms that slides up or down or left or right based on the X/Y/Z axis configured trough the events.