Sqrxz3 is finished since January. But we wanted to make a physical (boxed) release for it. This took a lot of time (print on disks, design and print the box, design the booklet, etc.). The design phase is almost completed and we hope to release it in July (no promises, though).
Sqrxz 4 is half done. Only the new features, which make the difference to Sqrxz 3, are still missing in the code.