I ordered an FL Audi A3 S-Line on the 28th February for delivery in Mid May...
I think you meant to write PFL instead of FL here? Otherwise confused...
So the end June/start July is only your estimation, no info from the dealer yet. I don't know about you but I'd certainly like to know how a car looked like before I placed an order for it. Still, since the discount you got wasn't that great I don't see it as much of a problem cancelling and chasing a better deal, hard to be worse anyway. However I don't know for how long you can still order a PFL or if you can even order a PFL as we speak. Depends pretty much how quickly you need the car. Unless my dealer surprises me tomorrow with something like 12% I will be sticking with my current car until the FL comes out and I know all details and prices. Also, if your budget was maxed out to afford the -7% PFL then you might be needing to pay more for the same spec FL. Personally at this point, and If I already had a car (as I do) I'd wait.