to get best use of the deck, it is best paired with the Harrow Hand book:
http://paizo.com/products/btpy95zm?Pathfinder-Player-Companion-The-Harrow-H andbook
I love this prop. I also own the first deck, that was more playing-card sized. The deluxe deck, tarot-proportioned, feels more comfortable in my hands. Full disclosure: I suck at shuffling but the cards hanlde better in their longer size.
There is rules for a game "Towers" included with this book, bidding and bluffing. But the Handbook, link above, talks of more games. Game that could be played as a pathfinder character or by your gaming group during downtime. the games are "illusionit" and "Last Azlant"
Oh and Aroden is mentioned as part of the lore, the namesake of one of the games and linked to Harrow history. In the Harrow Handbook, above.
This is a review of the deck itself, not the book, but you will get more use out of the Harrow in your games with these together (feats, archtypes, equipment and magic items).
Another disclosure: the art is unchanged. But Kyle Hunter put alot of work into the original art, backstories, and creating them all from scratch. I do wish the art had been refined for the Deluxe Harrow Deck, by Kyle. though it was not. Admittedly the art on some of the common tarot decks is similar in style and line-work. So the art only seems less in comparison to the first Harrow deck.
I pre-ordered this and am completely satisfied with my purchase. Maybe you will too. 5 stars