I traded in a few PS2 games that were lying around today, along with some DS games that my wife no longer wanted.  I pre-ordered RB3 and picked up the Pro Cymbals that are running $40.  I've been using the RB2 cymbals for about a year now, and I really liked them.  However, one broke, so I figured that I might as well get the updated set.  After playing for a bit, I can tell you that the new cymbals are awesome!  First off, they are ridiculously quiet.  They make practically no noise at all, which is a welcome change from the plastic-y thump that the old ones had.  Also, the 30 degree tilt on them definitely helps keep me from accidentally getting caught up underneath them (a particular problem that I have on fast songs).  So far, I haven't noticed any cross talk or dropped notes.  I'm definitely looking forward to trying Pro Mode with these. 
 
Speaking of which, I'm interested to see how the hi-hat rolls will be charted for RB3.  I suspect that they'll just stick with the standard red as hi-hat, yellow as snare that they've done in the past.  However, I'd like to see if they chart Pro Mode as yellow hi-hat roll, with the snare being the yellow pad.  Guess we'll see in a week!