If you are looking for a Sencha Touch Extension to emulate Coverflow take a look at this:
It works only on iOS devices since Andriod has bugs with css animations (same for Chrome running on Linux)
So you can try it using Safari (Mac & Win) or Chrome (Mac)
Get the code at: https://github.com/elmasse/Ext.ux.Cover
Comments, feedback, issues are all welcome!
PS: Thinking about to rename package to Ext.ux.touch