Anyone who uses keywords from their referrer data will now see a big bump in [not provided].
This makes life harder for SEO, but the https (ssl) google searches are completely about privacy & security, which make it a worthwhile tradeoff I think. In some repressive countries (and some less transparent "democratic" Western nations) the government can just scan the net for people searching for certain terms, get their IP address and from there monitor every site they look at, and possibly their email as well. SSL search prevents this. This doesn't, however prevent Google from recording what searches you make or your IP address makes, it just prevents eavesdropping via powerful network tools.
So now google will add a layer of obfuscation that makes google referrals closer to being as anonymous as Facebook referrals!