It will either come to Grayjay when a community member makes the plugin to add it as a source or FUTO has enough interest from the community to create it themselves.

No idea.

Good news is anyone can do it, implementing additional video sites doesn’t require any changes to the app like NewPipe - just requires any dev to write a plugin and share it online. Grayjay’s plugin system is pretty well thought out IMO, there’s a brief overview on YT covering how to develop one

Since Veoh also has a login system, that could make things take longer since a dev would now need to think about optional account integration features