It's official. Florence bus and tram ticket prices will increase from 1.20 euro to 1.50 euro on July 1, 2018. The previous price increase was several years ago (maybe 2011 or 2012).
I haven't seen anything indicating whether the standard ticket price will apply to the new tram between the airport and the SMN train station area. Hopefully that will be the case, as the distance is about the same as the terminus of the other 2 tram lines where the standard ticket price applies to all stops along the lines. A recent announcement by the mayor says testing of the new tram lines will begin in February and that they will be fully operational by June.