Sounds very cool and if you read closely you can see that the type of Patron effects the how the type of pact manifests. Here's what I mean, a say Demonic (Patron type) Book (Pact Type), Pact would grant more spells and ways to shape spells, but the the Demonic Patron would effect the choicies you have for spells, the way you can shape them, and the flavour of course.
Another example a Fey (Patron Type) Chain (Pact Type), that allows you to summon Fey beings and bind them to your will, maybe even cast spells via them. So the list of Patrons would each include Book, Blade, and Chain benifits depending on the pact type you choose.
Or at least that's what Mike seemed to be saying.
In the Future I doubt you'll see any more Pact types aa you'd have to update all past patrons so most future additions to the class will be probably be Patrons.