Just a repeat.... None that is currently advertised or really known about.
This likely is largely due to the split ownership arrangement that the Universal Orlando Resort had between Universal/GE and the Blackstone group prior to Comcast buying Universal and then Blackstone's stake in the UOR. I'm guessing that the accounting side when you have to deal with different owners and subsidiaries really worked against a dual-resort AP option, especially with the likely limited niche market it would appeal too.
Who knows though.... With Comcast's new ownership and interest in the parks and studios, we might see them consider offering such an option in the future sometime.