Mark Rosewater made it clear in his blog that there are far fewer reprints then in a core set.
Anyways this article mentions a World Guide. Could this end up akin to a Planeswalker Guide, but for FR?
Magic: The Gathering’s Adventures in the Forgotten Realms delves into Dungeons
“We did a full concept push for this set, like we do for any Magic set. Obviously there’s already a ton of art exploring what the Forgotten Realms looks like. There’s not necessarily a ton of of art or color art establishing the look of specific geographical regions like the Evermoors, or the Spine of the World, or the High Forest,” Wyatt said. “So all of these lands — almost all of these lands — do actually point to specific places that we developed in the world guide, though I think that forest right there is an example of elven architecture, rather than a specific place, so that was also one of the areas we explored in the world guide.