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I got the recognition of the serial ports to work.

        function before_form_nut($pkg) {
                /* return available serial ports */
                $handle = popen('dmesg | grep \'^uart[0-9]: \[FILTER\]\'','r');
                $read = fread($handle, 2096);
                pclose($handle);

                /* explode at the newlines */
                $read = explode("\n",$read);

                /* parse resulting text */
                foreach($read as $line) {
                        if($line!= '') {
                                $names[] = 'ttyu'.$line{4}.' (COM'.($line{4}+1).')';
                                $values[] = '/dev/ttyu'.$line{4};
                        }
                }

                /* find correct field */
                $i = 0;
                foreach ($pkg['fields']['field'] as $field) {
                        if ($field['fieldname'] == 'port')
                                break;
                        $i++;
                }
                $field = &$pkg['fields']['field'][$i];

                /* add available serial ports */
                for ($i = 0; $i < count($values) ; $i++)
                        $field['options']['option'][] = array('name' => $names[$i], 'value' => $values[$i]);
        }

The only thing i can find about the new ACL is this:

 - tcp-wrappers support has been added to the upsd server, to grant users access
   by source IP for commands that require to be logged into the server. This
   replaces the previous internal implementation (ACL in upsd.conf).

Unfortunately i do not know how to fix that.

Correct port detection still not implemented. Patch from first post still needed.
The new ACL works perfectly now.

I don't want to be the inpatient en annoying guy,
But could someone implement a fix so it recognizes both types of serial ports correctly? You would do be a really big favor!

I think I'm having a similar problem. I've got nut working on an alix with a USB/serial adapter, however the "auto" port function doesn't work.

The fix is to twiddle the ports option list in /usr/local/pkg/nut.xml manually and add the correct choices
Described at http://forum.pfsense.org/index.php/topic,43283.0.html

I know this isn't elegant, and it does get overwritten any time I upgrade.

However users already have to pick their UPS model and cable type from a list. Why not simply provide a list of all reasonable port choices?