I know that Justin already developed a new Theme Framework that he calls “Stargazer”, for Yikwanak Kole, the original Hybrid Theme framework is still the best and most logical as well as most expandable theme framework for basic wordpress learners.
WPYUI Themes appear in three major types. The first one is more simple and pure form of YUI WP Themes. Please visit http://yikwanak.com/kole/ to see this simple theme, as well as http:// melanesia.one and http:// papua.one
Another one is primarily based on the YUI Bubbling LIbrary by Caidy Patino some years back. The colour is milky one. Please refer to http:// melanesia.net for this type.
The third one is as can be seen here http://yikwanak.com and http://wpyui.com. This is simple but also based on YUI Bubbling LIbrary, but utilizing YUI.2.2 library.