StarWars.com has posted a news item confirming that the two existing trilogies will be released as Blu-ray/DVD combo packs on October 8, 2013. The new sets will "feature brand new cover artwork created exclusively for this release."
The two sets are available for pre-order now on Amazon.
These sets will only be available in the United States, but international fans will be able to pick up DVD-only versions.
Star Wars Trilogies Set For Re-release As DVD/Blu-ray Combo Packs