GDR3 Update and its implications

Hello

Its updrade time on my contract, I've had the Samsung Ativ S and will be buying another windows phone. I was thinking of getting the Nokia 1020 but I’m worried that with GDR3 update later this year and the grater specs that the OS will support will not just make the 1020 out of date but redundant very quickly. I don’t want to experience a windows 7 to 8 scenario.

Does anyone know what the future holds ;-) or more importantly what GDR3 changes will do to Windows Phone.

Thanks