As you will notice, most of the port maps you see here are fairly similar. You don't really get anything radical or cool. I would say the most technologically advanced portmap we have right now is the one for the 64cc polini puch kit. Once you get into water-cooled kits, you may see some cooler stuff, since you can go with a more radical portmap so cooling is taken care of, but as far as more advanced portmaps go, you kind of need to look into grafting racing scooter cylinders onto moped bottom ends.
If you do research on the different kit cylinders, or even look on the performance spreadsheet, you can begin to get an idea of what top speeds people are reaching with different kits.