One important detail is that cash will no longer be accepted on board any vehicles, either for fare payment or topping up the balance on a CharlieCard. The proposal includes a rollout of more ticket vending machines and more third-party vendors.
They offered a website for suggestions on where new machines should go. That site is: http://gisdev.massdot.state.ma.us/planning/proposedafclocations/
(The URL they gave at the meeting was actually www.mbta.com/AFC2-locations, but it redirects to the above.)
So if you want to tell the T you want a machine near you, this is a chance to say so.
Edit to add: Here is the text from the suggestion website.
"As part of the MBTA’s new Charlie fare collection system rolling out in 2020, we will be installing fare vending machines (kiosks) at some bus stops and partnering with businesses to vastly increase the locations where people can add money to their MBTA transit account. In addition to these locations you can add money online and then tap your new Charlie Card, smartphone or credit card to board. Riders won’t be able to add cash onboard buses and trains in the new system, so we want to make sure that everyone has the opportunity to reload their account in convenient locations.
This feedback tool allows you to give input directly to the MBTA on where you think it’s most important to have the fare vending machines or retail locations. Zoom into the map to see the locations of our current fare vending machines (yellow flags). The new system will include all of these locations, in addition to hundreds of new locations. Please select “Propose New Fare Vending Location” to add a pin for the locations you propose. You can also agree with locations already proposed by selecting them from the list and clicking “I Agree”. For more information about the project please visit our website https://www.mbta.com/afc2"