Uno Rev 3 and J2

Atheling:
Thanx it was nagging me why its there and marked and couldnt find any info on it, the Why not a biggy, sure i could find somre thing on that somewhere, any idea what the othe two pad are for just above it?

Thanx for the answer

JP2 is the 4 "pads." They are actually holes for header pins to be inserted but they just filled the holes with solder. I believe it was for an upcoming feature which never happened...