There was a tracing session at BSDCam and the notes from that session are here: BSDCam Notes
markj has added the illumos if statement code to HEAD and plans to MFC it in the near future
Loops have not yet made it into Illumos.
gnn talks about adding compressed files as an output mode
markj mentions that dtrace(8) has already used up many of the option characters and wonders what we should do about that. Perhaps a -x option space makes sense.
shrikanth asks about the MFC of boot time DTrace (anonymous tracing) and offers to test
shrikanth says they found a bug when running two instances of DTrace and will send a backtrace to dtrace@freebsd.org
markj wants to turn on the tests in src.conf but will need to do a bit more work before that can be on by default