GD bbPress Toolbox Pro 3.5 is now in development and it is planned for the first half of February 2015. But, I have made plans for this planning to cover the development for the whole 2015, and to reach 4.0 version in the Autumn.
3.5 is the next major release that will be released in the first half of Feburay 2015, and this release will include some of the features that were most requested in the recent months and all are related to signatures: use of TinyMCE (WordPress default) editor for signatures, use of BBCodes Toolbar (from GD bbPress Toolbox) for signatures and limiting who can edit signatures. After 3.5, plugin will get 3.6 and 3.7 each on the two month schedule. After the Summer, work will begin on the major 4.0 version that will be out in October or November 2015.
To see what is planned for 3.6 and 3.7, and some of the preliminary planning for 4.0, check out the plugin roadmap page. This roadmap can change at any time, and it is possible that some 3.6, 3.7 and further features can be shuffled around.
Let me know if you have more suggestions about this release, or you have found some bugs that should be fixed in this version.