Denis Shergin announced on the Unigine development log today that the Unigine Engine is indeed running on Android (he also provides a photograph of it running on such a tablet).
This is a full port of the Unigine framework, renderer, Unigine Script, the physics component, and other sub-systems. The Android port is currently targeting NVIDIA TEGRA 2 platforms. In doing this port, the Unigine Engine has picked up support for a Java-based launcher, multi-touch screens, and OpenGL ES 2.0.
Evidently they already have a major licensee planning to use the Unigine Engine in this mobile space as he notes a major announcement coming soon. "Yes, now Unigine engine works on Android-based tablets and smartphones! More handheld devices will be supported soon (there will be a loud public announcement later), you can contact us on licensing Unigine for mobile platforms as well."
Obviously you won't have all the same graphical abilities and other features as the full-blown engine that is capable of dropping the best CPUs and GPUs to the floor, but this is very interesting news coming from these Siberian developers.
Meanwhile, look for another Unigine OilRush game announcement soon.