It is always prudent to contact the school district to confirm enrollment availability. You may contact the Dublin Unified School District at 925.828.2551. You may also want to check out their website at http://www.dublin.k12.ca.us/
Good luck with your home search!
You might want to call them to make sure that you have a definite answer.
I do not want to gamble with my kid's future - I am happy renting in Pleasanton. Thanks so much for your answers, and best of luck to people who are paying the property taxes only to see their kids end up in not-so-great schools 5-8 miles away.
I can try calling the school district but I doubt they will give an accurate answer, as they cannot. They'd wiggle their way out of the questions as they cannot be certain about anything, given the messed up planning with zero capacity/infrastructure impact analysis before building a gazzillion homes.