Unfortunately, no idea, your best bet is to ring customer service to find out, as this also depends how many EE have received from Apple and if out of stock, when they receive a new shipment, we would not know here in the forums.
Your new contract will not start until you receive your new phone and put the SIM card in it.
To contact EE customer service dial 150 from your mobile phone or ring customer service for free using web based app or another phone: +44 800 079 8586 or +44 800 956 6000.
