:) my joke about having a non-existent 'pre' release aside. The reason is
simply that Trisquel 6 does not include a kernel which will load the free
firmware and neither is the firmware included.
All kernels which load non-free kernel and Debian's kernels (I believe)
should load the free firmware. The linux-libre kernels have blacklisted the
loading the firmware and thus require updating.
If you add jxself's repository and install the firmware linked to from the
product page (now updated) you should get it to work on Trisqul 6.
Otherwise you will need to wait for Trisquel 6.5 (it appears) as Ruben's got
to apply a patch and that patch might be considered a significant update. The
plan of action is to release such updates (ie 6.5, 7, 7.5, etc) every six
months. At that point you'll get more than just security updates. You will
get other updates like new versions of the linux-libre kernel.
