Technological developments have made complete rewrites for porting to other systems unnecessary. Gamemaker runs on PS4/Vita, both Unity & Unreal run pretty much everywhere, Construct 2 itself exports to Wii...so if PS4 supports HTML5 (which we know it does) and can support WebGL (we know it MIGHT), well...no real reason to get another company involved, is there?
Perhaps unnecessary but sometimes there are other factors to consider.
I'm super interested in consoles and handelds! : )
That said, as I'm alone on the project, I know I won't have the time to handle it correctly myself.
There are a lot of TRC / rules to follow, and I'm not good at it.
My focus is on the lead PC/Mac/Linux version, and I'm talking with others studios to see how the ports could be made.
Nothing confirmed for now, I'm at the very beginning of the discussions : )