They have been pulling permits for AWS antennas in CT for over six months and it doesn't say anything about replacing cabinets or anything like that. all it says is they are replacing 3 PCS for 3 AWS.
Edit: so I just went back and looked at the permits and they are replacing most or all the antennas but are not using multi mode antennas. So it's 3 PCS 3 AWS 3 cellular 3 LTE.