While WWE and Hulk Hogan are still negotiating, the latest report is that the two are close to a deal. Creative is currently working on several different match and storyline scenarios for Hogan at WrestleMania 30.
The most recent talks had Hogan working with John Cena in some way. One possibility is to have Hogan in Cena's corner while another has Hogan teaming with Cena against the Real Americans. There are also reports that Roddy Piper may be brought in either for a singles match with Hogan (the only singles match for Hogan being discussed) or to team with a heel against Hogan and Cena. Another idea being suggested is Hogan teaming with Piper to face the Real Americans.
Nothing is official right now, but WWE is working under the assumption that Hogan will come to a deal with the company by WrestleMania 30.