I was on the AirTrain this past Monday, and the fee was still $5.00 with no signs talking of any change/ increase.
NJDavid- you are getting off cheap! My NJ Transit fare just went up to $203 monthly into NYC

On another note, lately I've found the AirTrain going from EWR to the train station to be subject to delays. On three separate trips (out of EWR) in the past week, I've had to wait anywhere from 5- 15 minutes for the next train. This despite the fact that the trains runing to the parking area were running on time!!