Morris didn't give any further details as to the features Apple's service will offer. Last week, WSJ reported the service would cost $10 per month for unlimited music with no free, ad-supported tier.
As of Friday, Apple had yet to sign deals with Morris' Sony Music, or Universal Music Group, or Warner Music Group, but will likely make the announcement even if the deals are not solidified. WWDC will take place tomorrow, June 8th at 10AM PT / 1PM ET from the Moscone Center in San Francisco.