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In http://www.pbase.com/flyingphotog/image/70301772 (Cessna LSA
concept), there is an odd-looking device coming forward from the end
of the right wing. Do you (or anyone) know what this is? My guess is
that it is some kind of special instrumentation for research, like some
kind of pressure sensor, or possibly an antenna.

Looks like a pitot tube with a tennis ball on it.

It's common for aircraft flown for certification purposes to have a special
pitot tube place well outside the bulk of the air disturbance caused by the
wing and fuselage, such as seen in that photo.

The tennis ball, well...you know.

Pete