If you bought your PC in last couple of weeks, chances are you'll get Windows 8 upgrade for free just $14.99. People who bought an eligible Windows 7 PC after June 2 can fill out an online form to apply for the Oct. 26 delivery of the upgrade. As of that date, MS will email codes for upgrade. Installation will be downloadable, but more info should be in that email. If you prefer installation DVD, that will be an extra $70. Offer covers 140 countries.
For the rest of Windows owners (XP, Vista, older Win 7), not eligible for this promo, there will be second wave of upgrades, priced just $39.99 for Windows 8 Pro version. Again, it will start rolling out on Oct 26th, but there is still no queue for this one.