I think there is no official new version... However, my pair (s/n 19008) has more than enough bass for modern music along with non-abrassive treble. I haven't experienced any painful peak or even a moment of HD800's treble hitting my ears uncomfortably.
I would say that with my LCD-2 (newest revision), treble is very calm but can sometimes be a bit uncomfortable to ears (only to treble-sensitive people like me and only with certain recordings/moments, because of their peak around 9-10 khz). But with HD800, I haven't experienced any trouble with highs AT ALL, even with neutral SS amp and with modern music. Not a single moment of pain or bad feeling. With brightly-mastered metal recordings, you can feel that overly bright sound but it's nowhere near what people normally say about HD800 (extremely unforgiving, unbearably bright with neutral amps, painful treble peak around 6khz, not enough bass etc.).
My pair sounds great with almost everything I throw on them... Female vocals started to sound really nice after some sort of burn-in (I guess I currently became a believer...). Electric guitars are still rather a bit analytic and overall signature is still significantly "heavier" with LCD-2 in comparison to HD800 but I must say that I actually prefer the bass of HD800 because it's very nicely defined as well but MUCH MORE separated and therefore a lot more real and enjoyable to my ears.
I must say that I now agree with David's opinion that these headphones are a NEUTRALITY KING. Yes, after burn-in, these definitely are very neutral... So "musicality" seekers should definitely reach for appropriate amplification.