It knows the IR for changing channels, Play/Pause/Stop/FF/REW, etc. It currently won't do subchannels, but if you're using a tuner with only whole number channels (like cableCARD) it should work fine.
I still want to retire the thing someday, but my wife likes it too much, since everything we record has the commercials auto-stripped out.
That's cool that they added a bit of support for it though.