There is new page about Espresso and it is also listed in the main page.
However, Espresso is NOT an embedded linux device. This is one of famous esp8266 device but it does not use Linux at all.
I think it is inappropriate to this wiki and I would delete it from the main page. What do you think?
The Espresso page was added by request. The community around elinux is evolving to include much more technology than simply embedded linux. If you don't think that page should be here, I'd suggesting posting to the discussion page attached to the Espresso page and/or contacting the page authors directly. You can see who's worked on that page by looking on the page's history.