In short: Yes!
PowerPanel does support IPv6, but only if it can control the systems connected to PowerPanel also supporting IPv6. If you have an old hosting server, it probably doesn't support IPv6, so PowerPanel can not do any magic there. But if your connected systems do have support for IPv6, PowerPanel will also control this for you.
IPv6 and hosting servers
If your Plesk server has IPv6 setup, PowerPanel will detect the IPv6 settings from your server. You now see the IP address v6 displayed in the server details.
If your customer orders a new website, PowerPanel will also provide the IPv6 to your hosting server.
Below you see the settings of your plesk server
Below you see the IPv6 setup in PowerPanel as well.
IPv6 and DNS
If your connected DNS servers also has IPv6 support, you are able to use IPv6 records in your DNS management. Choose the AAAA record type (IPv6 address record) and enter the values. Make sure you use a valid IPv6 address.