Update 2: Llama has been returned to the Play Store this morning as promised, listed as version 1.2012.12.29.1412. As for the pesky silent mode/vibrate bug? This version's changelog indicates that it is "hopefully fixed."
Update: It looks like KebabApps has pulled Llama from the Play Store while the developer sorts out "a pain-in-the-butt problem involving silent mode," in which the app can – for some users – switch what should be silent mode to vibrate mode. KebabApps, in a blog post, provides more information on the issue, along with a (hopefully) fixed download, which users are encouraged to test, and which will be uploaded to the Play Store "tomorrow morning."
Llama, an extremely popular location-based profiling app, was issued an "über üpdate" today, bringing a handful of big changes from a new UI to bug fixes.