The one that I really am going to keep an eye on is the Sinopoli/Dresden M4. I really dislike slow tempi in M4 (I hate the MTT/SFSO M4, for example), but Sinopoli seems to find a way to keep long performances interesting. We'll see.
With G. Schwarz, I'm afraid that he'll have the tambourine part played on a side drum, just like he did in the M3 performance that I saw with you in Seattle (an issue of confusion, or misinterpreting what's called for with the German word, "tambour"). Kubelik often performed M7 with the tambourine part played on a side drum.
Barry