Upcoming Raspberry PI board revision

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You can determine which board revision you have by typing cat /proc/cpuinfo at the command line and looking up the hardware revision code in the following table:

MODEL AND REVISION CODE(S)
Model B Revision 1.0 2
Model B Revision 1.0 + ECN0001 (no fuses, D14 removed) 3
Model B Revision 2.0 4, 5, 6

There has been a small change to the GPIO pin out of revision 2.0, to add ARM JTAG support and to present a different I2C peripheral from that which is (heavily) used on the camera interface. Users wishing to produce portable GPIO code should either avoid using the these pins, or add code to check the board revision and behave appropriately.

Main change categories / things are:

Reset
USB Output Power
JTAG Debug Support
I2C Support on P1/P6
Version Identification Links
Additional I/O Expansion
+5V0 Leakage from HDMI
SMSC +1V8
Mounting Holes!
LED Marking

Read more at http://www.raspberrypi.org/archives/1929