The word per MMAJunkie:

A long-rumored matchup between Dan Henderson (25-8 MMA, 0-1 SF) and Renato "Babalu" Sobral (36-8 MMA, 2-1 SF) will headline a currently unannounced Strikeforce event slated for Dec. 4 at the Scottrade Center in St. Louis.

The fight is set for the light-heavyweight division and will air live on Showtime, according to multiple sources close to the event, who told MMAjunkie.com (www.mmajunkie.com) that the promotion formally will announce the event early next week.

Additionally, Herschel Walker (1-0 MMA, 1-0 SF) is expected to fight in the event's co-headliner against an opponent to be determined...

Walker, a former star NFL running back, recently returned to San Jose, Calif.'s American Kickboxing Academy, the gym which prepared him for his professional MMA debut in January at "Strikeforce: Miami." The 48-year-old newcomer and lifelong martial artist made good on his training and stopped the unheralded Greg Nagy by second-round TKO. Walker's MMA debut drew considerable media attention for Strikeforce, and it also scored its biggest Showtime ratings of 2010.

For those unfamiliar with MMA, Strikeforce is the second largest MMA promotion in North America behind the more popular UFC. Walker has always trained martial arts such as Tae Kwan Do, but Tae Kwan Do isn't really applicable to modern MMA competition as western kickboxing and Muay Thai kickboxing really stifle the TKD stance and attack. Walker was largely brought into the Strikeforce organization to bring them mainstream attention, which he did by giving their Strikeforce: Miami fight card a strong number on Showtime.

Doubters of the Dawg legend were silenced first by his training at American Kickboxing Academy -- which houses a number of top MMA talent such as current UFC contenders Josh Koshcheck and Cain Velasquez -- and then by his performance against Greg Nagy. Nagy is nothing more than a club fighter, to use boxing parlance, but Walker's takedowns and relentless ground-and-pound proved even at 48 years old he has more stamina than the average heavyweight in MMA. With almost another full year under his belt at AKA, it should be interesting to see what new skills the Greatest College Football Player Ever can bring into his next fight.