There are no special modes in the game or planned simply because you own a PREM/LE. The only software differences are about the different hardware changes between the PRO and the PREM/LE.
Here are the Software differences between the PRO and PREM/LE:
1 -
The PREM/LE has a Glider feature that goes with the glider divertor.
2 -
The PREM/LE can lock a ball in the LAIR area.
There are multiballs that take advantage of this. For example, during Ninja Pizza Multiball if you have mushrooms on your pizza you will be able to lock a ball in the LAIR. You can not get mushroom on your pizza on a PRO.
3 -
The PRO has a TOP LANE Skill Shot that is not on the PREM/LE. The ball doest go from the shooter lane to the top lanes on the PREM/LE.
4 -
The PREM/LE has 8 balls and the PRO has 6.
A - Not really a rule difference but the balls will come from the Van on the PREM/LE as needed.
B - You can have 7 and 8 ball multiballs on the PREM/LE. For example, on the PREM/LE, you can have 5 gummy bears on your pizza and therefore start a 8 ball Ninja Pizza multiball. On the PRO the most gummy bears you can have are 3 for a 6 ball multiball.
I think thats it.