Yes, there is. A military member who is out of California under PCS orders is considered a CA non-resident for tax purposes, and is subject to tax only on CA-source income. An example of California-source income would be rental income from a property located in California. The same rule applies to the spouse of a military member who leaves the state because of his/her spouse's PCS orders.
Bottom line: if you and your wife have no CA-source income, you are exempt from CA state income tax.
**Answers are correct to the best of my ability but do not constitute tax or legal advice.