(1) People power will come to life. Advances in technology will allow us to trap the kinetic energy generated (and wasted) from walking, jogging, bicycling, and even from water flowing through pipes.
Possible, I'd say. Not holding my breath, but this is at least benign.
(2) You will never need a password again. Biometrics will finally replace the password and thus redefine the word 'hack.'
Yes you will. Authentication that relies on a single factor has been proven time and time again to be inadequate. The most viable authentication methods have almost always relied on at least two factors, the rule of thumb being "something you have and something you know" .. the latter being a password, or a PIN, or some other piece of information you memorize. Until we can all do public-key encryption in our heads, passwords or other memory-based authentication factors will be necessary. Even if they take a form like "crimson, eleven, delight, petrichor".
(3) Mind reading is no longer science fiction. Scientists are working on headsets with sensors that can read brain activity and recognize facial expressions, excitement, and more without needing any physical inputs from the wearer.
Only a complete extrovert would find this idea anything other than absolutely horrifying. (Granted, extrovert-chauvinism is endemic to this culture, so it's not surprising this would be seen by major decision-makers as a good thing.) I cannot imagine any future where I would trust any real-world government run by any of the kinds of people who've been running things until now with any knowledge of what's going on in my mind. The moment they think they know what's going on in our heads with any degree of reliability, people start getting preemptively locked up by "precrime" units for crimes the state thinks they were about to commit, either in a genuine (if misguided) effort to protect "the public", or as a pretext for locking up people who disagree with them .. most likely the latter, in my experience. (And I'm not even going to open up the can of worms of whether they really do know what people are thinking. Being convinced they know and being wrong is even worse than actually knowing.)
(4) The digital divide will cease to exist. Mobile phones will make it easy for even the poorest of poor to get connected.
Probably. The continuing value of being "connected" just for its own sake remains to be seen.
(5) Junk mail will become priority mail. "In five years, unsolicited advertisements may feel so personalized and relevant it may seem that spam is dead."
I'm almost as disturbed by this as by (3) above. There's a real danger in the cognitive merger of advertising and human interaction that, again, I'm not sure is getting nearly as much critical attention as it deserves because the type of people who promote advertising tend to be extreme extroverts who don't have much of a grasp of the self/other boundary. However, for those of us who value our own internal identities and prefer to draw a clear distinction between interacting with actual human beings on an individual level and the (increasingly intrusive) encroachment of advertising on those interactions, or for me at least if I'm the only one, spam will always be spam, because unsolicited messages designed to persuade the recipient to buy a certain product or have a certain positive emotional reaction to a certain brand will be intrusive whether they're personalized or not. And I for one don't want them personalized and indistinguishable from my interactions with family and friends. I want there to be a clear distinction between the two -- I want advertising to be honest about the fact that it's trying to sell me something.
One of my biggest concerns with blurring that particular boundary is that advertising sells candidates for public office, as well, and it uses the same end-runs around our conscious cognitive processes to make its pitch, which is one reason I'm not confident that more than a few people in this country really vote with any effectiveness for their own interests. The Tea Party exists largely because of that kind of advertising -- it's probably the best example I've ever seen of people being persuaded to vote directly against their own interests by messages that appeal to their baser emotional needs. Do I want that kind of advertising to be so pervasive that it becomes just like chatting with my friends? That, to me, is a nightmare scenario, and I don't want any part of it. If that's where the world is headed, don't say you weren't warned.