They are not discontinued and are still supported.
You can take part in the new Beta firmware for the mixers if you wish.
Link: https://forums.presonus.com/viewforum.php?f=386
"We ask that all questions and bug reports for public beta issues be directed to the public beta forum, and not via technical support tickets or calls. Tech Support will not be able to assist with beta software and firmware. You should direct all questions, concerns, and bug reports to this forum in the appropriate section."