Cashless tolling is coming to the Hugh L. Carey and Queens Midtown Tunnels in January, and to all MTA bridges by the end of 2017. That means nobody will have to stop, weave or merge into a different lane at the toll plaza ever again. Since you already have E-ZPass, you can keep paying your tolls as usual. Just take a moment to make sure:
Your E-ZPass tag is mounted properly – so we can read it and give you a 30–50% discount every time
Your license plate is registered to your E-ZPass account accurately – to make sure you avoid getting toll bills in the mail
To update your E-ZPass account visit www.e-zpassny.com
Visit mta.info/cashless for more about cashless.
[TLS-58]

and what happens if i don’t have ez-pass?
I don’t have EZ pass and have no intention of getting it.
This should answer all your questions – straight from the website that TLS linked in the article:
Cashless tolling is a new form of toll collection coming to all MTA tunnels and bridges by the end of 2017.
With cashless tolling, no one has to stop to pay tolls any more. Instead, all cars simply drive under a gantry, in any lane they choose.
If you have an E-ZPass tag in your car, sensors will read it and deduct the appropriate, discounted toll from your account. If you don’t have E-ZPass, cameras will photograph your license plate, and a bill for the non-discounted toll will be mailed to the registered owner of your vehicle. You also have the option to use our Pay Toll Now service to open a short-term account using your license plate and credit card.
Be sure to pay any “Tolls By Mail” bills you receive promptly, because people who don’t pay will be subject to fines of up to $100, registration suspension, and more.
Whichever way you choose to pay, cashless tolling means that no one has to slow down or stop to pay their tolls again – so all your trips can be faster, safer, and better for the environment.