Kazuchika Okada vs Shingo Takagi Announced for Wrestle Kingdom 16

Today at NJPW Power Struggle, Kazuchika Okada challenged IWGP World Heavyweight Champion Shingo Takagi for a championship match, and the latter accepted his challenge.
Takagi successfully defended his title against Zack Sabre Jr. After the match, the current G1 champion Okada came to the ring and made a challenge for a title match.
Okada congratulated Takagi on his victory and thanked him for his hard work. After that, he said now the time has come for the G1 champion to take over the champion and carry the company. His belt is the contract and he wants to find out who is the real deal. (h/t NJPW Global Twitter account)
Takagi responded by saying that he thought he would have to call Okada out here. He said to Okada that he is carrying the G1 championship and he is still the IWGP World Heavyweight champion. Then Tagaki suggested finding out who the strongest is on January 4 at the Wrestle Kingdom 16 in Tokyo Dome. Okada approved his suggestion.
Earlier during the show, Okada also had a match in which he defeated Tama Tonga and defended his rights for a title shot.