That isn't entirely correct. Neither was my statement though. It is more or
less what they did in any event.
I'm pulling this from my head. Feel free to reply with corrections. Provided
my memory serves me correctly this is the details of the press release:
Adobe has said they are dropping support for the old netscape plug-in
architecture on GNU/Linux and teaming up with Google to support a new one. In
the process Mozilla has said they won't be implementing this new plug-in
architecture.
Adobe has said they will continue to release new versions of Adobe Flash for
Microsoft Windows platforms using the old netscape plug-in architecture
system since Mozilla won't be implementing the system. They won't be doing
the same for GNU/Linux though. However they will be supporting Google's new
system on GNU/Linux so Chrome GNU/Linux users will have access to new
versions of Adobe Flash.
Adobe has committed to providing security updates compatible with Mozilla
Firefox and other browsers for another 5 years. If you are using Mozilla
Firefox on a non-free distribution you will be stuck with Adobe Flash 11
indefinitely.