All the talk of this recording has piqued my interest, and based on my liking of Barenboim's 7th, I decided to pick up this recording. I found the first movement to be a tad fast (and I usually listen to Haitink's 1st RCO recording, which is fairly brisk). However, I do quite like the recording over all.
As to the oboe at the end of the movement, I have to say I do not really enjoy that approach overmuch, though it is not a deal-breaker. I think it is as Barry says-it is difficult to sustain such a long note and be pp at the same time.
I noticed another odd "woodwinds in front" moment in the first movement. Right at the grand statement of the main theme (around the 3 minute mark), you can hear clarinets quite prominently. In most of the recordings I have, I can scarcely hear them. Maybe Barenboim and the Staatskapelle players are simply bringing out details in the piece that have hitherto been overshadowed in other recordings (primarilly by strings)?