Hi Emma and welcome to planDisney!
How exciting that you're planning a trip to my number 1 holiday destination - 
Walt Disney World! 
First of all, let me tell you that there is absolutely nothing I love more than having a brand new Disney countdown so, I completely understand your eagerness to get something booked.
While it might now be possible for you to book 2027 holidays to Walt Disney World with certain Travel Agents, here in the UK, you can only currently book Hotel + Ticket packages with the Walt Disney Travel Company, via the UK version of the Walt Disney World website, for dates in 2026.
Typically, in the past, a Free Dining deal of some sort has been released in April for visits during the following year. If this pattern continues, you can expect to see a promotion similar to that of the current 
Free Dining & Drinks in 2026! deal, being released in April 2026 for visits during 2027.
When booking directly with the Walt Disney Travel Company, it is not possible to simply apply a new 
Deal to an existing Hotel + Ticket package. 
So, for example, if you were to book a 2027 Hotel + Ticket package when they are released and then later on a Free Dining promotion was announced, in order to take advantage of that deal, you would need to cancel your original booking (which could incur a cancellation fee) and then make a new one.
If you plan to book your visit via an alternative Travel Agent, I would recommend contacting them directly to ask them the question. Terms and conditions of booking do vary from Company to Company.
There is, of course, no guarantee that a Free Dining promotion will be offered in April 2026 for stays in 2027 but, this has been the case for the past few years. Because of this, if I were you, I would probably hold off booking your 2027 trip until April 2026.
I would definitely recommend keeping an eye on the 
Walt Disney Travel Company website from March 2026 onwards to see if details of a Free Dining deal for stays in 2027 has been advertised/released. This way you'll be ready to book as soon as the promotion goes live.
I hope that this information has been of help, Emma and I'll keep my fingers crossed that you're able to get your trip booked ASAP.
Wishing you a magical holiday filled with memories which will last a lifetime!
Emma