Here's my take:
(1) People power will come to life.
Hmmm, most people who use a PC or tablet (unless they're playing a game) tend to sit quietly at location for hours on end. There's not a lot of opportunity to harness power. Now it might be possible for such harnessing to power cell phones and iPods, but unless cell phones use significantly less power, this is a no-go.
(2) You will never need a password again. Biometrics will.....
Yes, immediately after voice recognition and AI take over. Biometrics might take over for informal use, but it's too flawed (either too many false negatives or false positives) for widespread use. It's much more likely that a personal SKEY-type personal RFID might become available.
(3) Mind reading is no longer science fiction.
It's no longer science fiction today, but even if it is cheap enough, our minds are too scattered to have this as the primary mode of input.
(4) The digital divide will cease to exist. Mobile phones will make....
May parts of the world live on less than one dollar a year, virtually no infrastructure, and have virtually no need for technology that doesn't directly contribute to the bottom line (i.e. surviving). The digital divide will be around for years to come.
(5) Junk mail will become priority mail.
This might be come true, but it would be priority mail for mail services who want to gain extra income, not users.
Okay, let's assume that all people play by the rules of using this smart feature (and that there's enough gold at the end of the rainbow to end world hunger).
Smart junk mail is the modern equivalent of Microsoft Clippy. Yes Clippy tried to be helpful, and often did provide users with valuable information, but it was still hated precisely because it was unsolicited.
This is not to say that junk mail can't be made valuable. If mail could be pulled into three bands by mail providers, "Regular Mail", "Smart Mail", and "Junk mail". It has to be something that depends on the mail providers, not solely the mail publishers since we can't trust them. For most people, smart mail would be ignored unless you were looking for a deal. You could then call on it as a supplementary knowledge base.