The Nikon 1 system with it’s one 1″ inch is one of the most promising camera lines regarding slow motion. With several modes unthinkable at this price point for decades. While the resolution is not HD, it can work for motion analysis and scientific purposes quite well.
Dpreview just posted it’s final review of the Nikon 1 V3 and it liked it a lot for its overwhelming set of features, it tallied a respectable 76% in their scale. The image quality is not as good as larger sensor cameras to be expected but it has its charm and versatility in a very small form factor.