Do you want the Final Fantasy XV: Episode Duscae demo along with your order of Final Fantasy Type-0 HD? You're going to have to hurry. As explained by producer Hajime Tabata, fans who want to dig into a 4-hour sample of the elusive next mainline installment will have to pick up their copies of Final Fantasy Type-0 with some haste. If you decide to pick up a later copy of the game, expect to be denied access to the demo completely.
According to a post on the Square-Enix blog, the demo will never be released as a downloadable standalone. The demo is supposed to be a "special gift" for early purchasers. Emphasis should be on the word "early", because only the first shipments of Type-0 HD will contain the demo. Hats off to Square-Enix for coldly coming out with the most effective and lucrative method to maximise pre-order numbers!
First, as Tabata-san said in a recent episode of Square Enix Presents, this demo is exclusive to Final Fantasy Type-0 HD. We’re never going to release it as a stand-alone piece down the line. Secondly, it’s intended to be a special gift for those of you who purchase early — the demo will be limited to the “Day One” edition of the game, meaning that only the first shipment is going to have the demo in it. So if the demo is something you think you might like, we highly encourage you to pre-order or to be quick about getting to the store on launch day, March 17th, 2015.
Oh, but don't worry. If you want to guarantee a spot on the elite list and have unconditional access to the demo, you can always pre-order the spanky collectors' edition:
Yours, for only $99.99.
EU equivalent is in white and as far as I know of, has a £79.99 price tag. Price in Euros will probably be similar to the US price tag.
Kotaku, NeoGAF