So what will the probate trial be all about?

The court will hear five issues, according to court papers filed by Shelly Sterling.

First, the court will determine whether the physicians' evaluations of Donald Sterling were obtained by fraud, undue influence or breach of fiduciary duty, as he claims.

The court will then decide whether Shelly Sterling's May 29 contract to sell the team to Ballmer is binding.

Even if the court doesn't affirm that, the judge will weigh whether the contract is nevertheless binding on the couple's trust because it's in the trust's best interest -- in other words, whether it's too great a deal to pass up.

The court will then have to examine how Donald Sterling later revoked the trust in June -- in apparent retaliation for his wife negotiating a proposed deal to sell the team -- and whether his revocation prevents the sale of the team or the court's jurisdiction over the trust.

Finally, the judge must decide whether to provide relief to prevent injury or loss.

How did this deal ever get done?

Facing pressure from the NBA, Donald Sterling signed a letter in May -- on the same day when one of the physicians examined him -- to the basketball league agreeing to the sale of the Clippers and authorizing his wife to negotiate the sale of the team.

But Donald Sterling changed his mind on the entire controversy: He sued the NBA for $1 billion for its decision to ban him for life and force him to sell the franchise. He then opposed the proposed sale of the team negotiated by his wife.

What's the rush in all this?

The contract between Shelly Sterling and Ballmer has a July 15 deadline to close the deal -- with a 30-day extension, if needed.

At the same time, the Sterlings face a September 15 deadline to sell team, as set by the NBA.

If not, the league may sell the franchise on its own or renew termination proceedings against the Clippers or both, according to NBA general counsel Richard W. Buchanan's statements in Shelly Sterling's court filings.