Who are the key developers, and where can I follow their progress and decision making? I want to follow the most up to date developments of Bitcoin, (such as M of N transaction confirmation).

Who are the primary developers of Bitcoin and what is the most efficient way to track the progress of this and similar activities?

I'm interested in reading either a detailed activity view, or a high level bullet point of key developments.  Ideally someone would offer both information formats as an answer.



A nice summary view would include the following ideas and a status on testnet and on the production network:


IPv6 support 
Zero confirmation AKA miner promise
The core developers are listed on the main Bitcoin page, while everyone that contributed code are listed on the About page. Probably the most up-to-date info on what is happening with the code would be on the GitHub repo.