The person that wrote the post is Adam Ruppe. He's a very prolific D programmer, best known for these libraries https://github.com/adamdruppe/arsd and for publishing a book on the language.

It's too early to judge how much support there will be. I don't expect current users to split into camps though. My prediction is that the relationship will end up being similar to Ubuntu vs Debian. An example is string interpolation. Walter wants to stick to his own proposal, which nobody else likes, while Adam's already implemented his proposal in OpenD.