I think it depends on timelines versus the building launch.  Based on what I've seen there are at least some cases where properties don't change hands at the original price, they change price at the secondary market price.    

If the building is occupied, but not yet registered as a condo corp., what I've seen is the transaction is priced as though it is registered, however, there can be big gaps in the information transfer between the purchaser and the developer.   

There is far too little clarity around all of this.