Jürgen, on the Cultured Code blog:
The final release of cloud sync as part of Things is still off by a few months. But we plan to publish more details about what we are doing (and have been doing) every few weeks.
OTA sync has been a major drawback for Things since day one, but the problem got a lot worse since OmniFocus’ OTA sync has gained serious traction. Hopefully, Cultured Code can make this happen quickly.