GeoTools 2.6.x looks to be focused on quality and performance.
As always the scope and timing of releases is set by you - the members of our community. There is a host of interesting "unsupported" modules that can make it into this release based on time and funding.
Andrea Aime has been cleaning up one of the top issues on our technical debt page - cleaning up after the transition to GeoAPI filter done way back in GeoTools 2.3.
There is a Technical Debt page with details of some "undone" work (often work left over when a commercial funding ended for a specific task).
A GeoTidy project has started up based around the GeoTools referencing modules; we will see how this project goes and will continue to work on collaboration.
Thus far the "Next Generation" JDBC DataStore are worth being excited about (making use of prepared statements for both speed and security).
We also hope to see an introduction of a "N-Dimensional" GridCoverage "DataAccess" API.