If you like searching on the Net you will find some preliminary
interpretations of what has been imaged, heard, measured
and detected.
So far...
(1) No thunder has been heard on Titan.
(2) There have been indications that wind has been heard near the surface.
(3) Winds of upto 15 mph have been detected on Titan.
(4) Mushy/wet subsurface material has been interpreted from the data.
(5) Meandering channels have been imaged; mostly likely carved by a cyrogenic fluid [past or present].
(6) Concentrations of Methane have been measure in Titan's atmosphere; they are
higher near the surface. Draw your own conclusions.
(7) Thick cloud/haze levels at 20 km [12 miles] up.

(8) And a surprise coming up. Check the 98 frame animation taken he surface
of Titan [spacedaily.com]. What's moving or shifted there? A fluid of somekind?