A release candidate of Gnome 3.7 is already out and Gnome 3.6 stable release is scheduled on September 26. However, development never stops in Linux world, and the developers are already making plans for the next releases. Currently, you can suggest some features for future Gnome releases as we announced earlier, and Gnome 3.8 feature freeze is on October 22nd this year.
A draft has been created of the possible Gnome 3.7 and 3.8 schedule. After the feature freeze, developers will have lively discussions about features to be included from October 29th. The release team will have a meeting on 5th November about final features to be included in Gnome 3.8. We may see first betas of Gnome 3.8 as early as February 18th.
Keep and eye on this space for more Gnome 3.8 updates.