I believe it is on the "View Disney offers" section only. I don't recall seeing the specials anywhere else on their site. I will usually get an email from Chase letting me know about the offer but it usually arrives 1-2 days after each special begins. If anything I would expect to receive it a day early or at least the day it begins, but 1-2 days late does not seem to be an advantage to me!
I don't know about you but I haven't been impressed at all with the Disney offers that chase has been offering lately. I imagine the discount for the marathon entry really helped lots of people! (NOT!). Anyway, I am grateful for the Disney dollars so we will keep the card (but we pay it off monthly).
But usually the DIS knows about the discounts and Visa codes first even before that page is updated. And like the first reply says, waiting for email is a fool's errand.