(From Dayton Ward's blog)
Thanks to a heads-up from defcons_treklit, I can verify that CrossCult, the publisher responsible for German translations of the first three Star Trek: Vanguard, plans to publish a translation of Open Secrets, and release their edition (titled Offene Geheimnisse) in May 2009 simultaneously -- or, pretty close, anyway -- with the regular English-language version. You can see their page for the entire Vanguard series here.
According to the site, they also plan to translate the existing line of Star Trek: Titan, beginning in November 2008.
Woo to the mutha-effin' Hoo.