The graphs that depict size are misleading. The initial release (today) is already at v0.9 and the site (opened 1 week ago?) says it's "fully ready to use in production" The video aims to enumerate and demonstrate a number of issues with jQuery UI and Sencha touch ("we can't get anything to work..."). "Zepto is slow", Zepto objects are big and have "large footprints". "We polled a large group of developers...".
This is OSS. Why is the trashing of other developer's work necessary in promoting your own?
On the other hand I do appreciate that someone has delved into mobile issues and is trying to address them. But why market it like this? Why tack on "an HTML5-ready jQuery" for no (apparent) reason. CSS3 transitions aren't html5. querySelectorAll is not html5. Those other libraries don't have their problems because they are not "HTML5".
I don't know, it doesn't sit right.