Ok, there must be a lot of traffic on the rewards site... it was really slow to load...just checked and there is no announcement. However, when I looked under the Theme Park benefits section, I noticed for the first time the inclusion of the word 'dining.' It could have been there all along and I never noticed it, or it could be something new (don't know, but certainly hope so). I find it interesting that the other categories (Meet N Greet, merchandise, tours) has a description of the benefits, but dining doesn't. Perhaps a slip on their part? Here's a cut and past of the first paragraph.
Make sure to pack your Disney Rewards Visa Card whenever you go to a Disney Theme Park. You're entitled to some special perks, like discounts on select merchandise, dining and tours, an exclusive Character Meet 'N' Greet event and more.
The word "dining" has always been there. If you look under DLR -- it has dining discounts at particular restaurants. I've looked on all the sites and nothing yet. My bet is that it will be Monday!