Just a moment ago there was a chat for features as plugins for 3.9.
A list of these new work groups will likely be set up at: https://make.wordpress.org/core/ and then at https://make.wordpress.org/core/features-as-plugins/
At the end of the chat discussion came to how difficult it is for the newcomer to contribute to WordPress, and of feeling left out, afraid of asking questions. I know a few things about this myself, as I helped out in a few of the features as plugin groups for 3.8.
But as nacin the general lead developer for WordPress said after closing the official chat:
“Please never worry about pissing off a developer or doing something wrong or wasting someone’s time. I get pissed at developers who get pissed off at contributors. ”
It is better to step into it and ask and take a chance then just letting it go. It is fun contributing at whatever level. I have made a few mockups along the way for core groups in 3.8 and that was a lot of fun.
Here is a good article in taking part:
Over the next few weeks new core plugin groups will form for 3.9. I am looking forward to seeing what new features will get attention for the next release of WordPress!