NJPW released a press conference which you can watch below for next year’s Wrestle Kingdom 12 featuring multiple NJPW stars like Kenny Omega, KUSHIDA, Marty Scurll, Will Ospreay, and more. The actual press conference starts at the 30 minute mark.
NJPW has already confirmed a number of matches that will take place at Wrestle Kingdom 12 on January 4. The main event will be Kazuchika Okada defending the IWGP Heavyweight Championship against Tetsuya Naito. It was previously announced that Chris Jericho has challenged Kenny Omega for the IWGP United States Championship at this past weekend’s Power Struggle Event and the two will meet at NJPW’s biggest show of the year. 
Below are the matches announced so far for January 4’s NJPW Wrestle Kingdom 12 Event:

IWGP Heavyweight Championship Match
– Kazuchika Okada (c) vs. Tetsuya Naito
IWGP United States Heavyweight Championship Match
– Kenny Omega (c) vs. Chris Jericho 
IWGP Intercontinental Championship Match
– Hiroshi Tanahashi (c) vs. Jay White
IWGP Jr. Heavyweight Championship Match
– Marty Scurll (c) vs. Hiromu Takahashi vs. KUSHIDA vs. Will Ospreay 

IWGP Jr. Heavyweight Tag Team Championship Match
– Roppongi 3K (SHO and YOH) (c) vs. The Young Bucks
ROH World Championship Match
– Cody (c) vs. Kota Ibushi 
Aside from the matches above, it is also expected that a New Japan Rumble Match will take place as well as a NEVER Open-weight 6-Man Tag Team Championship match and a IWGP Heavyweight Tag Team Championship match, plus much more.