I finally got around to the new Abbado M4. It was cheap at Barnes and Noble.
I'll begin at the end, Renée Fleming had no business singing this score. Her voice is too big and her tone is too brassy to even begin to attempt to sound childlike. She is obviously reining herself in and trying to match Mahler's demanding specifications. She isn't succeeding. Imagine Voigt or Eaglen - or, Heaven forfend - Nilsson trying to do this, and you'll get an idea of my impression. Her style is a little too cutesy (and sulky, as others have noted); like Schwarzkopf, but worse.
I seem to be the most consistent defender of the new Abbado Mahler, and I'll continue that defense here. There are some problems, but I don't think that they're as awful as Mr. Hurwitz thinks they are. Abbado has a concept of the score that would be better suited to Chicago, Cleveland, or Vienna. The Berliners are not much of a Mahler band, with a few notable exceptions. In order for Abbado's idea to come off perfectly, he needs a very precise, virtuoso band or a group steeped in Mahler (however revised the brewing story has become).
This is a solid performance, and - if you can overlook Renée Fleming - it is solidly in line with the best of Abbado's new Mahler. I get the impression that Universal wanted DG to cash in on Renéemania, and this seemed like as good a crossover as any. Note the Berg Lieder if you want proof of this. Boulez' 4th wasn't coupled with anything, as I recall.