re: Latin Proununciation: V as in wet
giving rise to the old joke about Caesar dividing the Britons into 3 parts; the Weeny, the Weedy and the Weaky. (Veni, Vedi, Veci) We were taught V as in Vow at school by a guy who was old enough to have been around at the time and only later learnt that the "W" sound was "correct", and could make sense of the joke.

On plurals of Latin words in English, the majority UK usage is the English form, though some Latin forms such as stadia, fora, compendia (and of course flora and fauna) can be found, and die hards such as myself use them from preference. There must be several others but I can't think of them right now.
Rod