It depends. Full & immediate rescinding doesn't seem quite likely because Hanen is just a District Court Judge (5th district). District Court Judges in the 9th, 2nd, and DC Circuit have ruled to various degrees that DACA can stay enacted pending future lawsuits.

I don't see the 2nd, 9th, and DC Circuits staying their own decision, so DACA is likely to remain in effect there.

However, Hanen is a total shithead so he could order an immediate partial cancellation of everyone in his district (5th district). This is called a circuit split and... they sometimes happen. The only court that can resolve splits is the Supreme Court.

If Hanen does order immediate cancellation, then interested parties can appeal to SCOTUS and SCOTUS can stay his decision pending the outcome of the suit in the 5th District Court of Appeals -- SCOTUS is not likely to take up the lawsuit until it bubbles up through the appeals court. Or... SCOTUS can just do nothing and wait for the issue to come to them through the appeals court normally (ie: Hanen's decision to cancel DACA in the 5th district will remain in force)...

There's probably less than a 1% chance of Hanen agreeing with the other district courts. He's one of the most notorious, anti-immigration judges on the federal bench right now. He's literally argued that mothers of children should be prosecuted for smuggling their children into the country.

Anyway - if you live in Texas, buckle up. It's about to get interesting extra fast.