Let’s create a 2.2 branch and start removing the current tagging implementation. I’ll announce on my blog that 2.2 will be delayed.

Based on how long it takes to extract and test a tag-free 2.2 we’ll aim for either the 30th or May 7th best case, depending on how many people help out with the process. Ryan will also look at bringing back widgets as an easy, tested, and already-popular feature that will sex up the release.

I think trunk should start experimenting with the new taxonomy proposal on the list, which has the potential to do some really neat things, but I think it’s also going to introduce a lot of complexity and need testing beyond the window for 2.2. Pushing it to 2.3 will allow it more breathing room and for us not to rush a pretty critical building block of WP going forward.

— Matt Mullenweg

上面的文字来自wp-hackers邮件列表里Matt Mullenweg的邮件，WordPress 2.2推迟发布，我们还是期待2.3吧:)