Features of DirectFB 1.6 have been talked about in DirectFB 1.6 Release Is Imminent With New Features, Early-Stage DirectFB For Android Devices, and DirectFB 1.6 Is Coming Soon While 2.0 Is Far-Out. Check out those articles for details on the interesting DirectFB 1.6 feature-set.
The latest plan for the 1.6 release was on the 6th of April, which was announced on the 1st of April, but that didn't pan out. However, last weekend the DirectFB developers did put out an interesting demo showing what's possible with the DirectFB 1.6 pre-release.
This demo, which was live-captured on its X11 back-end, is showing DirectFB's Ilixi compositor with several applications running. What's interesting is that using software acceleration they've managed decent performance with penguins running around 50Hz constantly even while dealing with other applications. The Ilixi compositing is tear-free and are running "maximum speed asynchrously synchronized with the compositor." This was while doing up to ten DirectFB processes on an Intel quad-core desktop. The developers claim that even for an embedded device with hardware acceleration a 1GHz sinngle-core CPU will be more than enough.
The WebM video demo along with other details can be found from this DirectFB.org page.