Suspect James Holmes has so far refused to cooperate with authorities, local police told the Associated Press.
"He's not talking to us," said Aurora Police Chief Dan Oates.
Today's hearing is to advise the accused of the charges against him. Those will include suspicion of first-degree murder and possibly aggravated assault and weapons violations, according to the AP.
Holmes will not yet be required to enter a plea, Bloomberg said.
Key to building the case for first-degree murder will be establishing that the attacks were premeditated. Police are collecting evidence that allegedly shows Holmes planned the attacks for months beforehand, according to The Guardian, including surveillance footage of him taking delivery of the more than 6,000 rounds of ammunition and bulletproof clothing he bought on the internet.
Police have also recovered the suspect's computer from his booby-trapped apartment, Agence France Presse reported, which may reveal crucial traces of forward planning.
The apartment also contained a Batman poster and mask, police sources told Fox News.
Many people in Aurora believe the attack was calculated to win its perpetrator publicity – and have vowed not to give it to him by refusing to use his name. Colorado Governor John Hickenlooper refers to Holmes simply as "Suspect A," Reuters quoted him as saying.
President Barack Obama, who visited victims and their families in Colorado last night, also avoided speaking the suspect's name.
"In the end, after he has felt the full force of our justice system, what will be remembered are the good people who were impacted by this tragedy," Obama said (video below).
The president's address was followed by a prayer vigil for the victims in Aurora. According to the Denver Post, thousands of people came to leave flowers, light candles, and pay their respects.