They just released a new version of IE10 preview and it's expected to go gold in about 2 months, so they're giving time for websites to prepare before releasing

They just released a new version of IE10 preview and it's expected to go gold in about 2 months, so they're giving time for websites to prepare before releasing it. >It may even undermine voluntary adoption of the tag, since it no longer represents an explicit request not to track I think this is sort of like how Apple disabled third party cookies in Safari on the iPhone by default and then Google was caught circumventing it. It could end up in a PR nightmare for advertizing companies if they don't follow DNT requests, whether opt-in or opt-out.