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The angle of view is a measurement of the view plane area of an optical system in arc degree.
Ultrasonic motor (USM) in this case should not be associated with human being audible frequency. I do not think the lens manufacturer builts it for the reason of no noise during operation, but the advanced simpler control of the lens movement by using the sinusoidal electric wave at the ultrasonic range frequency. Ultrasonic motor is low speed and high ...
"R" stands for Ring and means the lens is equipped with an aperture ring. From Fijifilm's FAQ: http://faq.fujifilm.com/digitalcamera/faq_detail.html?id=110201428&pnum=1833
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