Weighing in late on this thread, but IMO I'd just as soon Leica didn't put IS in the next M10. IS would be one more new trick for Leica to learn (slowly, as they tend to) and one more thing to boost the cost of an already hideously expensive body. It works well in my Canons, but it's only there with lenses that need it (physically long, and somewhat slow f-stop). And it's essential in my DLux3, which because it doesn't have a normal viewfinder requires being held away from the body. I've never had a problem bracing an M camera steady, particularly since available focal lengths are at a conservative limit.