While we don't know for sure, Samsung would be the most likely party to have requested the re-examination. The autocorrect feature was used by Apple when it requested a preliminary injunction against the Samsung GALAXY Nexus handset. During those hearings, Judge Lucy Koh ruled that Apple would probably be able to win its case at trial in relation to the autocorrect patent. Samsung has since used a workaround to avoid any further legal problems with the phone.
Any re-examination and subsequent invalidation of the two patents wouldn't occur for some time, well after next year's trial.