"This GitHub fork enables Node.js to optionally use the Chakra JavaScript engine on Windows 10, allowing Node.js to run on Windows on ARM. Our goal is to merge back into master after stabilizing this code, fixing key gaps and responding to early community feedback."

Their goal is to work on it, stabalize it, and then merge it back in once it's ready for general use. Microsoft's "fork" wasn't trying to split the community or create a permanent new path. It's to build something new for Node.js that shouldn't be in the main project until it's ready. Microsoft wasn't trying to split the community, but rather trying to take on an experimental project.

The io.js/Node.js situation wouldn't have been influenced by Microsoft's announcement. Node.js/io.js didn't necessarily have an intention of reuniting in the future and might have stayed apart. By contrast, Microsoft doesn't intend to split off from Node.js at all.

Yeah whatever. Microsoft is no threat to FOS server-side solutions like nodejs, given their reputation. Nodejs is its own worse ennemy.