Currently my PC is connected to the BT Home Hub via a ethernet cable, will this PC need anything wireless wise (something it currently does not have) when I get the laptop?
In a nutshell no, my system is: the main PC is e/net connected, the upstairs PC is wireless, lap tops can either use wireless or e/net, depending where they are being used.
BUT make sure you use good encryption, the default one on the BT hub is piss poor.