Faulty lightning port on iPhone 5

Hi,

I have a faulty lightning port on my iPhone 5, causing it to sometimes charge and more often than not, not charge at all.

I have spoken to Apple and have been made an appointment at a genius bar to have a like-for-like replacement.

Has anyone ever received an upgrade to a later model, or the same phone but in a different colour? Is this even possible? I am covered by a 1 year warranty but thought I'd ask.

If not then I'm not too bothered if I get just another black iPhone 5.

Thanks in advance. :)