Hi @sebgonzes
It depends on what you are expecting from this new version of Plesk. A lot of our customers asked an ability to use Plesk Panel without 8443 port, to have the ability to Restrict Administrators actions, and a lot of other small tuning things which already mentioned in the preview release notes.
BTW, a couple of cool features on the way. 'SSL for each domain for a mail web server' is one of them. We are waiting when Postfix supports this it and then we'll implement this feature for Postfix+Dovecot configuration.
Well, 8443 port is the plesk standar since the first version as well as cpanel have is own port, so, if it's not an bad things, I don't thinks that is an essential feature... There is so much things that would be important, first one of course, the ssl mail server for each domain, but not only, real distinct limit between web space and mail space for exemple, ( Create separate Mail and Web Space ) etc etc.
I really appreciate some feature as php7 for panel plesk 17.8 (it's really speeder now), let's encrypt for domain, import mail plugin, etc etc, but not seein nothing really great in the new version, only small feature without any big change for now.