I'm always on the lookout for new 4E books in print at my local FLGS, where I recently saw a paper book version of "Scarrport: City of Secrets" published by Reality Deviant Publications and Mongoose. My first thought was combining it with Freeport would make an interesting game.
(No offense is intended to the authors of Scarrport, if they are lurkers or posters on here).
I looked through the Scarrport book and noticed it had a new class (the elementalist), with half of the book taken up by new paragon paths, epic destinies, races, feats, equipment, and monsters. The rest of the book describes the town of Scarrport. I knew right away this book would be almost next to useless for my present 4E players. The fact that the player specific crunch is not present in the DDI character builder, may very well doom this book to having a lot of resistance from my players who have been totally spoiled by the DDI. I ended up putting the book back onto the shelf.
I don't like having to say this, but my impression is that any future 4E 3pp setting and/or adventure books where my first gut reaction is knowing that it would be almost next to useless for my players (ie. due to 3PP player specific crunch being absent from the DDI character builder), may very well doom these books to be permanently off my shopping list. These days I will not buy any rpg books which will not see any use in my games. The crappy economy doesn't help much either, where I find myself spending less in general.
I don't know what the 4E Freeport companion guide will look like. But if it resembles the Scarrport book where I get a gut reaction that it will be almost next to useless for my players, then it will probably change my mind about buying it. The same can probably be said about other already announced 4E 3pp settings in the pipeline for future release, such as Amethyst, Nevermore, Age of Legend, Scarred Lands, etc ...
In the bigger picture, the DDI character builder has such a huge hegemony over the 4E 3PP market that the only supplement books I will still presently buy and use in my 4E game, are mainly setting and adventure type books which can be used "out of the box" with the DDI character builder (ie. no new classes, no new races, no new feats, etc ...).
I find it amazing that we're even having such a discussion in the first place, just a bit over a year after 4E D&D was first released, and how fast this has happened. In contrast back in the early 3E D&D days, it took almost 2 or 3 years for the "d20 3pp bubble" to pop. This time around for 4E, there wasn't much of a "3pp bubble" to speak of.