I honestly don't think Yahtzee will do Batman: Arkham Asylum just to fuck with us. Yahtzee has NEVER been predictable enough to do what you think he will.
He's reviewed Painkiller, TWEWY, the XBLA, Saint's Row 2, Thief, 50 Cent, Valkyria Chronicles, and 2.5D.
He did specials on Webcomics, E3, ZP Awards Show, and DUKE NUKEM.
And let's not forget Little Big Planet, X-Blades/Halo Wars, and Munkey Ailand.
You can't call him predictable.