What open-source video editors are available with 4k capabilities?

Looks like Lightworks will be available for ubuntu next month.

http://www.omgubuntu.co.uk/2012/09/oscar-winning-video-editor-lightworks-landing-on-linux-in-october

Lightworks running on Ubuntu

Blender has an integrated Video Sequencer and supports 4K cinema resolution, a proof of that is that Sintel, a movie produced with blender, is available for download in 4K :)

http://www.blendernation.com/2011/02/20/sintel-4k-available/

More information about Blender here:

http://www.blender.org/

You can obviously install Blender from the Ubuntu Software Center.

Openshot, Shotcut,and Kdenlive now support the editing and export of 4K videos.

• Among them, the fastest editor should be Shotcut as it allows you to create optimized media and take utilization of GPU acceleration.
• Kdenlive is stable on Linux system, but temporarily not quite stable on Windows.And it doesn't support GPU acceleration and multi core CPU processing.

• Openshot is buggy and more basic.

  file-size-with-kdenlive