My prediction:

• Either SA has intel that Hezbollah is going to escalate and current conflict is going to expand.

• It's very unlikely that SA would push ahead with the deal with the US/Israel. If they did, it would be because they felt they felt they need security guarantees asap due to Iran escalating. This would make Saudi citizens potential targets for reprisals.

• Least exciting but not improbable explanation is that they'd rather be overly cautious despite there being no new intel. They're simply preparing for the seemingly inevitable ground offensive into Gaza.