Yeah that's what I'm thinking Mike. Upto ten times faster if the hype is to be believed.
careful on getting your hopes up.. certain functions - i cant remember which - are up to 10x faster, the over all card will not be however.....
imo if the gtx 1080 is over 50% faster than the 980 at the same price of the 980 at launch then that will still be a damn good upgrade.
I also reckon it will have additional benefits elsewhere - more performance per watt, so a cooler card, and therefore a cooler system (or the ability to shove more volts in it to overclock it better

)
bang for buck, the GTX1070 may be the one too look at..... if that comes in at GTX970- prices but with current maxwell titan type performance then that will be a great card (my logic is that is kind of what the GTX970 did last generation albeit hampered by the memory issue which i would think nvidia wont do that again)
I expect i will be getting a gtx1080, however my GTX980 should put me on till black friday... i have picked up some cracking bargains the last 2 black fridays