Yep, heard it at the show on Saturday. In my opinion, it takes IT03 to the next, more mature refined level. I can't analyze it in details yet, only had a short auditioning for now, but in general IT04 has a more coherent balanced tuning, very smooth transitioning from lows to mids and highs (not as v-shaped as IT03). For example, in IT03 I can clearly hear a dynamic and BA drivers, while I heard IT04 tuned with 4 drivers in a perfect harmony like it was a single driver. The sound was expanded, transparent, detailed, bass and treble extension was impressive, and I thought overall tonality was more on a natural/smoother side, though don't quote me on tonality yet. But I definitely heard it smoother than IT03. So, overall I feel like it's a more mature flagship tuning. I have a picture on my laptop at home, will post it later, but the shell had a more universal-custom shape like IT03, rather than IT01.