This is what GameInformer posted just a few hours ago and quickly removed.
According to the site, Final Fantasy Type-0 HD will be released on March 17 in North America, and will include a code to download the FF XV demo, called Episode Duscae, which makes sense since recently Square-Enix registered the same name in Japan, NA and Europe.
The removed article also mentions that is not yet confirmed whether the demo will be available the exact same day as Final Fantasy Type-0 HD.
Here you can read the original text:
Gamers have been waiting to play Final Fantasy XV for a long time, but a chance to sample the gameplay is coming soon. A downloadable demo for the next numbered Final Fantasy will be available in 2015, and lets players see some opening sections of the game in action.
Square Enix is calling the demo Episode Duscae, and though it focuses on the early parts of the game, some elements of the progression have been altered in order to make it more suitable for a demo experience.
Some players will be able to get Episode Duscae for free thanks to a voucher included with Final Fantasy Type-0 HD, which releases on March 17 in North America. A representative from Square Enix could not confirm that the demo will be available the exact same day as Type-0 HD, but it will be coming to both PS4 and Xbox One when it does release.
Via | AGB