If you’re a Microsoft partner and have been looking for a way to demonstrate the Office 365 cloud services to potential customers; this new site allows just that. Microsoft have set up a self provisioning demo site that lets you (the partner) configure a demo tenant account on the Office 365 platform and provide all the sales and demo content pre-loaded so that you can show how the services work and integrate. I believe there is also an option to transition the demo tenant account into a paid subscription if the customer wishes to order seats after seeing the trial.
To access this new trial site you need to login using your Partner login, the URL is: https://www.microsoftofficedemos.com/