The last time I remember them doing anything that significant was adding radio to the 600EX-RT Flashes, but even that was half-assed because they took away optical IR for no particular reason.
I think the 600EX has both radio and IR.
I'm pretty sure they DO NOT and I know for a fact that the ST-E3-RT Transmitter DOES NOT. They can be fired optically with another 600EX-RT but not optically with anything else. Normally this isn't a problem, but I sometimes mix my Profoto strobes with Speedlites on location and it presents it's challenges. Fortunately Profotos do fire optically when they see my Speedlites fire, but it would be nice to fire everything from my Profoto remote rather than relying on my Speedlites to fire my studio strobes. However at this point we are getting off subject, so let's get back to that new 50MP goodie shall we?
I'm no flash expert, but I've fired a remote 600EX-RT with a camera-mounted 90EX. I assume that's optically?