OK, got some answers. The reason we're seeing some LCD-like motion performance is because OLED--like LCD--is a sample-and-hold technology, even though the TVs have a very fast refresh rate. That means that each image/frame is kept onscreen, statically, until the TV refreshes with the new frame. CRT and OLEDs are impulse driven (also called pulse driven), so you see an image, then black, then another image, with a much shorter time between frames. (This is also why plasma TVs are a bit dimmer-they require extra brightness to compensate for the black between frames.) The way that the eye deals with these two different approaches is why sample-and-hold-based displays cause motion blur.
There are two ways to address this: frame interpolation (adding additional frames) and black frame insertion. In its OLED, Samsung's Automotion actually uses both approaches, and the TV lets you choose between them. I'm still checking, but we liked the company's ClearMotion setting--it uses black frame interpolation and maintains motion resolution, but it's a bit dimmer than when frame interpolation is used. Fortunately, OLEDS can get very bright, so it's not as big an issue.
We're still playing around with this (30fps content) as well as judder controls (with 24fps content), so I may have more to report, but I think I have a better understanding of why this set, as well as Gary Merson's review of the LG OLED, exhibit some LCD-like characteristics. Hope this is helpful.--Jim