I really don't see the point of the new phone. I spent too much money on this one to up and waste more on a new one so fast.
Maybe if I had money I would get it, but I don't at the moment. To me it's the same phone, with a better GPU. The quad core processor isn't really new, since the international variant of the Samsung Galaxy S3 has a quad core processor, but only 1 GB of RAM. While we had dual core, but 2 GB of RAM.
Also the international had a better GPU I think. But yeah I don't really see the big deal for this new phone, and we still don't know if Metro will get it (at least at launch).
It's cheap on contract though, at $199.
So yeah in my opinion this wasn't really that much of an upgrade. I'm guessing the S5 will be the best to get, since this felt like a slight speed boost with a better screen.