I can't speak for the posters in the back of the park, but the banners at the front say "Coming May 18th" now. Same exact look, just few different words. Still says check map for show times.
I don't think shows have soft openings since softs are mostly technical rehearsals to practice / work on / perfect attraction operations. But you should have an awesome time at BGT anyways! They have many great coasters and a very nice park Have fun!
and for all the dads get a seat up close. You will thank me :drool: