How Much Freedom with the GSL?

[DiasExMachina]

I know this might have been touched upon but I am having trouble finding as relevant post. If one does exist, I apologize and hope someone will point me in the right direction.

We are balancing either an OGL or 4.0 GSL route and our final answer would depend on the adaptability of the 4.0--basically whether we have to change our setting to mesh with 4.0 or whether 4.0 has some malleability to adapt it to the setting. So I am curious to know how much freedom this new GSL has. I understand these answers may not be official yet but is there any information on the subject. Specifically, can you throw out their magic system and create one totally original on your own? Do you have to employ their classes or can you create new ones? Thanks ahead all and I reiterate my apology if this has been answered previously.

[Morrus]

Given that the GSL itself will be available on June 6th (two weeks away), I'd suggest you base your business model on the actual document, not any rumours that may be found here.