I just saw a sign up at 2078 W Middlefield Rd., Mountain View, CA 94043 (I'm guessing that is the address that will be used) at the corner of Rengstorff that Tacomania will be opening. This is the location of original La Bamba and La Costena but in the new building that was put up in 2015. No opening date provided as of April 10, 2016.
Based on the reviews of the Tacomania taco trucks on yelp, I don't have very high expectations. Then again, Mamacitas is a short drive away in the Target parking lot and that has amazing suadero, compenchano, carnitas, al pastor and fish.