Like two days ago they updated it to the latest version which is now the 0.8... this does bring a lot of changes according to their official announcement page.
Main features in general...
*. Few GUI improvements.
*. Add/Remove multiple audio and video tracks.
*. Crop, change bit-rate, etc.
*. Various effects.
*. Import from DV/DVD or single files, etc.
*. Any codec supported by FFmpeg, Kdenlive supports (means: almost all the known codecs are supported).
Although these are very few to name and I'm not an expert on video editors, so I don't understand most of those "features" on their home page either :P.
Anyhow, in Kubuntu 11.04, 10.10 and 10.04 you can easily install the Kdenlive 0.8 by issuing the below command.
sudo add-apt-repository ppa:sunab/kdenlive-release
sudo apt-get update
sudo apt-get install kdenlive