Long answer: We are developing all the content within the guidelines set in the Open Gaming License, Version 1.0a, under the terms and conditions set forth in the System Reference Document 5.1 as provided by Wizards of the Coast.
You can review it here: http://media.wizards.com/2016/downloads/DND/SRD-OGL_V5.1.pdf
We're shipping the decks from Canada which means we don't the sweet sweet rates that teams fulfilling directly from the states do. Here's a breakdown of what it costs to ship 5 decks tracked from Canada to USA.
Several factors went into that decision - the cost for a Wizard set would be quite a lot more Paladin deck, and the stretch goals would mean that certain classes may not get funded, and we didn't want anyone feeling left out.
We intend to animate all the spells - and we are considering also making them available by class, down the line.