Unless NVidia changes their stance on custom chips, the only viable upgrade is an X2 instead of the X1. While that's about a 50% boost, that's not very much for a mid-gen upgrade. So not sure if they gonna do that at all this time around.
The Nintendo eShop rating Thread: http://gamrconnect.vgchartz.com/thread.php?id=237454
The Steam/GOG key gifting thread: https://gamrconnect.vgchartz.com/thread/242024/the-steamgog-key-gifting-thread/1/