EXPERIMENTAL! DOES NOT WORK WITH 2.57b Standard builds!
Get the latest Cycles builds from graphicall.org to test. For the record, this file was made with this windows build - http://www.graphicall.org/198 Now that the disclaimer is out of the way, the character has been reworked with materials and lighting for the Cycles renderer. Cycles is a heavy work in progress and likely to change often. This file may or may not work with Blender in a couple of weeks from now.
CC attribution the same as at www.sintel.org, details at: http://creativecommons.org/licenses/by/3.0/ Unfortunately Cycles didn't seem to recognize packed textures that well, so to increase the chance this file works for people, the separate texture pack is here:
Note: These are technically different files from the other Sintel Lite textures. They are higher quality png files with some modifications to look nicer in Cycles. Extract the 'textures' folder into the same location as the character file as usual.
Hair is mesh, eyebrows are painted, eyelashes aren't in there. Particles could be a while yet before implemented in Cycles.
Will do my best to answer questions, but in many cases this might break or not work completely and I won't know why. :)