The Transformers Collector's Club has revealed the Combiner for the Mayhem Attack Squad! Check out the attached image and their blurb below:
"We Are THUNDER MAYHEM! The Combined mode of the Mayhem Attack Squad has been revealed! Can Impactor stand a chance against the might of this powerful Decepticon? Get these 6 EXCLUSIVE Combiner Wars figures ONLY from the TCC. Order your set now at https://www.mastercollector.com/fss/login.cfm?eid=1009"