Nooku is a team of experienced software architects, lead by Johan Janssens, Lead Architect of Joomla 1.5.
The Nooku story germinated from a seed of an idea created during a conversation between Joomla 1.5 Lead Architect Johan Janssens, and some high profile Joomla users. It was 2007, and Joomla 1.5 was a great step up from the previous versions. But for the United Nations, the Belgian Police, and a number of companies, Joomla was missing enterprise-level multilingual features.
The ideas for the development model grew from there. The combined efforts of our partners allowed us to build innovative Open Source technology: First Nooku Content, for multilingual management, and later Nooku Framework, a new brain for Joomla, and the logical next step after the Joomla 1.5 framework. more at nooku.org
Joomla on the other hand just released its J!1.7 version last July 19, 2011. In addition, Joomla will have a Six-Month Release Cycle which is...
"A shorter development cycle that will enhance Joomla’s stability by providing more core feature development and adoption. Short-term releases will be in active development for six months, then reach the end-of-life one month after the next version’s release. Long-term support will be active for 15 months, starting with Joomla version 1.8. Version 1.7 will have a support cycle of seven months."
The community of Joomla now speaks up about integrating Nooku to Joomla. It has climb to the 20th spot in the community garnering 351votes as of the moment.
If you'd like Nooku be integrated to Joomla you can cast your vote at Joomla Idea Poll Forum