As feared, but better read for yourself. 
Mozilla is doing the Canonical dance … I wonder how healthy Ubuntu Phone is right now … I better check. Here are some quotes, the source is listed below.
“We will end development on Firefox OS for smartphones after the version 2.6 release.”
"Therefore we are announcing our plan to end-of-life support for smartphones after the Firefox OS 2.6 release. This means that Firefox OS for smartphones will no longer have staff involvement beyond May.
We will continue to assess the stack to determine fit with new projects coming through the innovation process (outlined below). Of course, Boot to Gecko (b2g) always has been and will continue to be an open source operating system open to contribution."
Source:
https://discourse.mozilla-community.org/t/firefox-os-connected-devices-announcement/6864