Valve has confirmed that earlier reports are false and there is in fact NO support for the PlayStation Move controller in Portal 2.
Valve's Chet Faliszek seemingly confirmed that Portal 2 will feature "full support" for PlayStation Move speaking with the German PS Blog. However it looks like the Google-powered translations of said interview mislead us English-speaking folk.
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Valve has told CVG it's not happening and puts the rumour down to a translation error. Valve's statement in full:
"There's a story making the rounds regarding Portal 2 support for PS3 Move. Unfortunately this quote was "lost in translation" -- Portal 2 does not include support for Sony's motion controller.