No, not really. They have no need to drop prices just yet. Once the cards launch there should be a slight discount.
Yes, that would be extremely overkill to max out games at 1080p.
If you want any game to be maxed out a 980Ti would work, if you want most, get a 390x.
However, why arent you considering pascal or polaris? I dont see why people recommend on speculation, but at least wait for them to be benched.
Initially they are going to be a little bit more expensive, but there will be cards in the price range of a 980TI (presumably the 1080) that should offer a bit higher performance.