Starting today, Universal will be using the same ticket pricing model at WDW. You’ll pay based on the day of the weeks you are going and get an overall total at check out.
If you have already bought tickets for an upcoming trip you can check the price. If it is lower to buy the new date based tickets Universal will refund that portion of the ticket.
For guests that can’t “pin down” a specific date Universal will have flex options available that are valid for up to one year from purchase.