This has been out like crazy in the PHP Community. All my RSS Feeds for PHP have like 2 or 3 links related to the ZF and Dojo partnership so you have probably heard of this post.
I have known about Dojo a few years back before MVC frameworks were going mainstream. I think Dojo was the obvious choice for the Zend Framework Team. Dojo is very mature and it has lots of components. I have no idea how bloated it is though. Personally, I would have selected jQuery because I use it and second, I love it’s small size and functionality. It is about time is tag along with the others and start using Dojo too