nope. although when direct x12 arrives you should be able to have both cards in a system.
they wont work in sli/crossfire but they will be able to be used as direct x 12 promises that it will use the best hardware available to render the screen in the most efficent manner possible.
ie: if fsaa is cheaper in resorces on the amd card it will use the amd card to render the fsaa.
if its cheaper to run fsaa off the nvidia card direct x will (in theory) use that card instead.
so while it may not work as you hope. when dx12 arrives you may be able to use both cards.