He's announcing the CSD Initiative, "an effort to get apps (both GNOME and third-party) to drop title bars and adopt GNOME-style client-side decorations... The only way to solve this problem long-term is to patch applications upstream to not use title bars. So this is what we'll have to do."
- Talk to the maintainers and convince them that this is a good idea
- Do the design work of adapting the layout and make mockups
- Figure out what is required at a technical level
- Actually implement the new layout and get it merged
Implementation is already in progress for Firefox, though it has not yet been started for other high-priority apps like LibreOffice, GNOME Terminal, and Skype. "If you want to help with any of the above tasks," writes Tobias, "come talk to us on #gnome-design on IRC/Matrix."