You can see the current trends by looking at job listings. E.g. http://stackoverflow.com/jobs?sort=i&allowsremote=true

Another good source of info is: https://github.com/lukasz-madon/awesome-remote-job

I think it has more to do with the company itself and less with the tech stack though. There are companies that get remote working (not necessarily new or startups) and others that they don't.

Real HQ - Maker of Agent Pronto, software designed to help make home buying and selling a better experience. We've been remote since the start, now 50+ spread across the globe

On https://realhq.com/jobs/ though:

Work Remotely

We’re looking for people who live in the United States.

Another company doesn't state that explicitly under http://www.surgeforward.com/careers/ - but they feature a map of stick figure "employees" spread over the US on that site, a clear indication they're in the same camp

For many companies "remote work" is synonymous with "remote work for US residents", and it's a totally different category from global point of view. I'd like to see some source that dinstinguishes between the two