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well, it's also going to save some power and allows larger amounts of memory. I'm just wondering why they would put it on the market in a month when nobody outside R&D labs has the hardware to use it yet.

Altera at the very least has FPGAs you can buy right now that offers DDR4 interfaces [1]. Also, I imagine a lot of this is directed towards OEMs who can get the early silicon samples of Haswell-E chips so they can start testing with them.

http://www.digikey.com/product-detail/en/10AX066H4F34I4SGES/...

integrated gpus should benefit from additional bandwidth.

Anandtech has some fantastic articles on memory speeds and the impact on applications, such as http://www.anandtech.com/show/7495/adata-xpg-v2-review-2400-.... There are measurable differences, though they are "slightly pushing the edges" rather than being make or break.