Currently, the TYPO3 5.0 (Codename: Phoenix) Team consists of six people who plan the architecture, create the concepts and write the code. You can check the development site to see what is going on.
Besides the concepts and code quality, it is equally important to make sure our new codebase still feels like our favourite CMS! That's why our development website, the unit test runner, and the online documentation need to be revisited and redesigned.
If you want to have a lot of freedom (nobody will say you "how to do it" or "what to do exactly"), fix design issues where you see them and want to make sure the TYPO3 community feels at home in the 5.0 project, then just drop me a line!
I'm very curious to hear from you, and thanks in advance for your participation!
Greets,
Sebastian
Have a look at T3ONE.com. You will find a lot of People there that could help you. Greetings! Olivier