Super Junior‘s Donghae's twitter post suggests a new SuJu sub-unit or not?

Super Junior‘s Donghae tweeted a news that will surely excite the global ELFs!
He posted, “Super Junior’s new unit during recording. Please anticipate.” 

After the creation of their 1st sub-unit Super Junior-M, composed of Zhou Mi and Henry, is Donghae's post suggesting of having another one or the 'new unit' he is pertaining to is the existing Super Junior-M since Zhoumi was on the photo with Donghae himself, Ryeowook, and Eunhyuk.

We don't know yet, all we can do is to wait.

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SOURCE: @donghae861015