Will web workers be shipped with Firefox 3.1?

Update: The next release of Firefox will be Firefox 3.5 instead of Firefox 3.1. See the news : Firefox 3.1 may become Firefox 3.5

It has been said for a long time that web workers will be shipped with Firefox 3.1. That was really a great news. But when I was reading the article of "Using web workers", I found out that it's said in this article that web workers would be shipped with Firefox 3.5. This change was made in March 6. Any mistakes here or the plan has been changed? I took a look at the plan, but it seems that the plan is the same.

See the screen-shot below. The top is the latest version and the bottom is previous version.