I just had a great drink from the stand on Wednesday night
I'd hate to sound like a pessimist, but I'm not holding out much hope for the tequila bar. Based on the dwindling beer and liquor choices around WDW, I can't see them stocking much variety in tequila.
I have a feeling they may have ~4 mid-shelf imported tequilas and they'll mix some standard drinks. If we're lucky , we may get a small serving area like the sake bar in Japan's Mitsukoshi store.