Sorry all. I somehow missed notifications for replies. I don't want to violate any rules by linking to external news articles - but a search for Tiffins prix-fixe lunch should bring it up pretty quickly. The menu isn't replacing the lunch menu, no. It's just another option. I believe it's already available - 11-3:30.
My question for everyone is -- would you keep an ADR for dinner at Tiffins or switch to lunch for the prix-fixe menu? I am a solo traveler, no qualms about adventurous food.