Hi Tim,
Please click on the following link
http://www.esri.com/software/cityengine/index.html
and look under "What's new" (bottom right) to download your free trial.
Thank you.
dear all,
to make things clear(er) 🙂 :
the TRIAL version is still the same as it was with previous versions. It is a 30 day time limited version that needs no license. Also, the TRIAL version can NOT be used to export.