During the first segment of the RAW tonight, you heard correctly. Goldberg stepped out at the start of the show, then made this announcement to WWE fans.
He had also teased that he was going to retire before saying that Stephanie McMahon approached had came up to him backstage on Sunday, then asked if he had one more title run in him. Goldberg actually signed a deal last week that would see him wrestling at least a few more dates with WWE and the eventual plan is for one more rematch with Brock Lesnar at Mania more than likely.
The 2017 Royal Rumble will take place from the Alamodome in San Antonio.