Hello,
I don't know if what you mean is displaying steady, falling, rising but if it's that, yes 1.31 can retreive, cache and display this info. You can see it working on this website at url :
http://www.vedr...weather.html wich running a preliminary version of 1.31. This oinformation is displayed as a little arrow near the barometric pressure.
Last thing : except for forecast displayed as text ("Partly Cloudy", ...) all the others data added for 1.31 will only be available if you get weather from weather.com because they are not in MSNBC data !!