The 4GB Pro inherits all the same abilities of its predecessors, like the Eye-Fi Explore Video, meaning it'll suck JPEG pictures and videos directly from your video camera, geotagging them along the way, pumping them through any open hotspot it can connect to (or secured one you know the password to) before routing the potentially embarrassing mess to the computer of your choice. If that computer is on they'll appear almost instantaneously; otherwise they'll get buffered somewhere in the cloud and delivered the next time that computer goes online.
New with the Pro is the ability to also beam RAW files straight from the camera, something that will make pros or would-be's a little happier when using this -- but with only 4GB on tap we're definitely thinking this is a product that'll lean more toward the serious casual users than hardcore pros. You know, wedding shooters and the like.
The other new feature here is far more usable: the ability to connect directly to a PC and send images straight to it. This means you can set up your Wi-Fi enabled Mac or PC to act as a wireless access point, configure the Eye-Fi to use it, and then watch as fresh pictures appear on your desktop -- cable free.