Yes, some DISers have mentioned here that the voicemail for Magic Kingdom Cakes says no more customized cakes after Dec. 15, 2016. However, there has been no official announcement like they claim in the article. And I am sure you will still be able to get a cake by calling the Contemporary—which most people have always had to do anyway because the MK Cake Hotline offerings were so limited.
This is the text from the email I received when I inquired about a Magic Kingdom cake on Sunday and I would consider this to be confirmation of the change:
Thank you for contacting Magic Kingdom Cakes! We have received your email and you will receive a response within 72 hours. We are in the office Monday- Saturday 8:30am - 4:30pm EST. We are out of the office all day Sunday and major US holidays.
Please note that all cake orders must be received 72 hours prior to your reservation date.
Cakes can be added on to existing reservations at table service restaurants in the Magic Kingdom, including Be Our Guest (dinner only), Cinderella's Royal Table, Liberty Tree Tavern, Jungle Skipper Canteen, The Crystal Palace, The Plaza Restaurant, and Tony's Town Square through this mailbox.
***Beginning December 15, 2016, cakes will no longer be available at Magic Kingdom Restaurants. If your reservation is past this date, please contact us closer to your travel dates as we are currently in the process of re-imagining new offerings. Chocolate and vanilla 6-inch cakes will still be available to order at the podium upon check-in (please note these cakes cannot be personalized)***
We look forward to working with you to make your dining experience extra special!
Kindest Regards,
The Special Occasion Coordinator Team
MAGIC KINGDOM® Park
MagicKingdomCakes@disney.com