Sennheiser is going to announce two new headphones at the IFA2010 here in Berlin,
the HD558 and HD598. As they are going to officially introduce them it the IFA, there is little to nothing known about them at the moment.
Judging from the number it's supposed to be the middle class, but that's just an educated guess...
However, Sennheiser is going to give a couple of these to users of the German Hifi-Forum.de before the official release date for a "pre-test". So as soon as there is any more information and/or pics available, I'll give you an update!
As I am also on the list for the pre-test, I have arranged that I receive the headphones in time for the European head-fi / Hifi-Forum meet so they will be there and can be heard. Guess we're going to have quite a few first hand experiences by the mid of September through the IFA an the meet.
Side note: I will also cover these in my short annual IFA report, of course.
Looking forward to your comments!