To see the list of bugs closed on this release, head to KDE bug tracker. It fixed more than 120 bug fixes and also introduces some new features which is recorded on core/NEWS file inside the tarball source.
Here are the new features in digiKam 3.0.0:
Libkipi : All kipi-plugins actions can be pluged to tools bar. Usability improvements in plugins configuration dialog. Libkdcraw : Update internal Libraw version 0.15.0 to support new RAW cameras : Adobe DNG: Fast Load and lossy-compressed DNG (LightRoom 4.x) Canon : G1 X, SX220 HS, EOS 5D Mark III, EOS 650D, EOS 1D-X Casio : EX-Z8 Fujifilm : X-S1, HS30EXR, X1-Pro Nikon : D4, D3200, D800, D800E Olympus : E-M5 Panasonic: DMC-GF5 Samsung : NX20, NX210, NX100, NX-1000 Sigma : SD15,SD1, SD1 Merill, DP1, DP1S, DP1X, DP2, DP2S, DP2X Sony : NEX-F3, SLT-A37, SLT-A57, DSC-RX100 General : Add new Noise Estimation feature to Wavelets Noise Reduction tools. General : Remove internal LensFun library code and xml lens database. Set only an optional$ ImportUI : Port icon-view to Qt4 model/View. ImportUI : Labels and Tags pre-assignation. ImportUI : Pipelined post download operations. ImportUI : Preview items during downloading. Metadata : Video files metadata support (through Exiv2 project). BatchQueueManager : Add Color Effect tool support. BatchQueueManager : Multicore CPU support to process items in parallel. BatchQueueManager : Add Raw Demosaicing settings in Queue Qettings. BatchQueueManager : Add new behavior options about RAW file loading (extract preview or perform demo$ BatchQueueManager : Add the capability to assign more than one time a tool to a queue. BatchQueueManager : Add the capability to put target file processed from queue to source album. BatchQueueManager : Add concept of Workflow dedicated to save and restore between sessions Queue Set$ BatchQueueManager : Add new tool to crop image.
I'm currently compiling digiKam 3.0.0 using my SlackBuild script on my SlackHacks. I will update the SlackBuild soon when the process is complete and i can confirm that it works without any glitch.
Stay tune :)
Update (February 9: 9:13 AM): It's now pushed to my SlackHacks. Enjoy digiKam 3.0.0