Yup; the blog will be updated daily. The content of the posts will probably vary; we certainly can't post Exciting New News every day once we get rolling, but there'll be stuff there every day.
As for Pathfinder itself, the basic goal is indeed to have about half of each volume be adventure; that's about 50 pages or so. The remaining pages will be things like explorations of cities and unique regions, articles about deities and other powerful figures in the world, ecological explorations of major monsters from the current campaign, and support articles that help with unusual situations that pop up now and then, such as how do PCs maintain a castle at the edge of civilization, or how exactly DOES this mysterious brand of ancient magic work? Now... there certainly isn't room for all of those in every volume; we'll probably have two sections of this type of material in each Pathfinder, each from 10 to 15 pages.
Each Pathfinder will also feature a gazetteer style section called the "Pathfinder's Journal" that'll give tidbits about the world Pathfinder and our GameMastery modules take place in. Finally, each volume will end with six or so new monsters, some of which will be featured in that issue's adventure, and some that only fit the adventure's themes and could be used anywhere.
The basic goal of this non-adventure section of Pathfinder is to maintain each volume's use after you run its adventure, or if you aren't currently running the adventure, or if (SCANDAL!) you aren't interested in the adventure. Think of it as a source book themed to support the Adventure Path but usable in all manner of situations beyond just that issue's adventure.
I'm sure I missed someone's question somewhere along the thread, but I'll be around these boards watching for questions, so if you've got any, fire 'em up!