when 5.0.1 is released officially you will be able to update simply by going into the settings and General then software update and it will download whats new from ios 5.0.1 and download it and UPDATE your device, if you want you can do a full restore by using the usb and using itunes as updating over the air will not let you restore so really that is the only reason why you would need to plug into the computer, if you have a problem or for what ever reason did not want to do an update and would rather restore