There was a flurry of updates last week. It kept things quite busy and crazy. There wasn't much else going on (at least not much else I noticed).
The OpenOffice.org upstream made the unfortunate decision to release a new version (2.4), but not mention that it fixed a number of security flaws until almost a month later.
The news page makes reference of this.
Practices such as this can be quite dangerous, as people will read the release notes, think there are no security updates, then possibly not upgrade. In reality there isn't a huge threat here, it's more just bad practice. Silent security fixes are never a good idea, and have gotten numerous other organizations in hot water.