If you’re currently a subscriber, you can keep paying the $15 a month you were paying before the free switch happened, and you get access to everything you had before–plus some cool bonuses, such as free in-game Turbine Points, which let you purchase additional items that free players would have to pay for a la carte. Likewise, you can create only two characters unless you pay for more slots.
Several classes, such as the martial-arts master Monk, are locked out for free users unless that user pays a small one-time fee, known as a microtransaction.
Now that Dungeons & Dragons Online: Eberron Unlimited is free, a few things do work differently.