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Experimental Serums is one of three upcoming power sets announced at SOE Live on August 15th, 2014.
It will be a Tank power set inspired by Bane. The power set will include Physical and Grappling moves as well as Injecting Serums and Mixtures for power interactions.

SOE Live presentation slide captured by Trexlight:

Note that ShapeChange was one of the Powers in the Alpha version of DC Universe Online that included Growth and Physical character changes.

v · e · d
Tank Fire (f) - Ice (f) - Earth - Rage - Atomic - Experimental Serums (u)
Controller Mental (f) - Gadgets (f) - Light - Quantum - Munitions
Healer Nature (f) - Sorcery (f) - Electricity - Celestial - Water