During the first week that La Hacienda was open, I had a long talk with one of the managers about a bunch of things. I made a point to ask about lunch, and he said that once things are settled and some of the early wrinkles are worked out, they're considering opening for lunch.
So while the answer to your question is "no" for the moment, that may change within a year or so. The biggest obstacle for lunch might be working out seating issues between La Hacienda and La Cantina.