This past week, NYC unveiled its first electric pedal-assist Citibikes. The new bikes look almost the same as the latest generation of Citibikes except for a small black box which you turn on to enabled pedal-assist. This will be very welcome for bridge commuters.
If you want to find one, open up your Citibike app and look for the lightning bolt icon next to docking stations. If you see one, that means at least one electric bike is available. As of now though, they are limited and you have to seek them out.