"After T3CON08 21 developers, most of them member of the TYPO3 core team, met for one week to discuss possible strategies for a smooth migration from version 4 to 5. The outcome is a new joint roadmap, visionary new features for both branches and a unified core team with a common vision for future versions of TYPO3."
After the motivated post from Martin Herr related to the T3TD08 also Robert Lemke published a article related to the outcome of the TYPO3 Transition Days 2008. Both a must read for TYPO3 enthusiast.
Go with the FLOW (german)
Article from Rbert Lemke on the FLOW3 Homepage