The Metro info website today claims online top-ups will be possible from July. I know that the new operating system for the Metrocard is currently being trialled so there should be some interesting things happening over the next few months. In addition to online top-ups I’m really hoping dairy’s and such will be able to act as Metrocard agents, rather like in London with the Oyster card. This would make off-bus top-ups even easier, improving boarding times and reducing cash fares.
Metrocard (Online Top-Ups)