I would rate my interest at around 3. Maybe I am more pessimistic than the next nerd, but I just can't bring myself to assume that 4E will be the Best Game Evar, sight-unseen. Right now, it seems that its biggest selling point is "look everyone...it's not three-five!" And while that proclaimation is easy to rally around, it is hardly unique. There are a lot of games that "aren't three-five" out there. I need a bigger reason to like 4E.
Up until just last week, we have been given very little "real" information on 4E. Sure, there were little teaser bits, rumors, rampant speculation, a picture of a mini or a pregenerated character...some of it good, some of it bad. But there was nothing solid, nothing really playable. I tried to run a "pre-4E" game with the piecemeal information that fans had collected and a fan-written adventure, and it was a catastrophe. Now that WotC has started filling the information void, my interest has started to pick up...but for a while there, I was getting tired of hearing about it. It's hard to stay excited about gossip.
This is probably why I am more interested in Pathfinder right now. Paizo has released much more information than WotC has, and they've released it in a much more useful format. Paizo is also soliciting playtesting from a much wider base of players...anyone who wants to playtest it can do so. In short: I've seen more of Pathfinder than I have of 4E, and I've played more Pathfinder than I have 4E. This doesn't make it a better game, necessarily...but it does make me more interested.
I imagine my interest will go up 2 or 3 points once I have the books...but unless 4E jumps the shark as soon as I open the box, my interest won't go much higher than that.