All of these proposals are great (even if every one of them isn't totally my cup of tea), and I'm hoping Paizo does something with all of them.
So, I was blantantly scarfing all four of these ideas, since I'm always in the market for new stuff my my campaign. In the process, I pasted them in Word and for curiosity's sake did a word count on each of them, at which time I noticed something interesting:
Clash of the Kingslayers: 2964 words
The Cliffs of Shattered Glass: 2980 words
Tomb of the Titan: 2952 words
Twilight of the Phoenix: 2099 words
Interesting how three of the entries are within 28 words of each other, and yet they don't feel like they're the same size.