4 USB ports, microSD (push release type), new form factor, no RGB (J7 labeled as A/V ???), no Link/FXD/100 led's (maybe integrated in magnetic's), same ram (512mb), display, camera connectors and 40 pin header.
Raspberry Pi Model B+ V1.2
http://www.zlham.geek.nz/images/news/rpi-b-plus.jpg
http://www.zlham.geek.nz/images/news/rpi-b-plus-close.jpg
Don't shoot the messenger.
Some more pictures with my copyright.
Pity I forgot to take the tripod ...sorry.
Oops the PiFace Digital isn't going to work like this.
It may need an extension socket.
ChipKIT Pi works but might require something on the USB to prevent shorting out.
Rubber buffer still works on the Ethernet
GertDuino probably could do with a lower buffer.
Wyolum Alamode clears, but again some insulation on the USB wouldn't go astray.
SleepyPi clears, but you might lose some of the prototyping area.
I would add some insulation on the USB just to be sure.
Sparkfun RaspiRobot has plenty of clearance due to the double socket
PiCrust was the same and the relocated Display socket is still accessible
PiRack not all the pins work, but clearance isn't an issue.
Mark
Yes the Pi Rack is the best Idea to lift a board or two away from the RPI the only problem is that the best way of using it is as you put it here, on it's side, vertically it tends to flop all over the place 
