The author suggested over at Char Ops that the Beast form feat needs to be specified as an implement only attack.
Though Sorcerers already have some a pair of area at-will powers, being able to take Wizard, Artificer or Swordmage at-wills and put them to CHA is pretty strong. Especially the Wizard ... because the second part of the feat is that you now count as a member of the class for feat, paragon path and epic destiny requirements. Which means a Half-Elf Sorcerer can take something like Scorching Burst, switch it to CHA, and then take the Enlarge Spell feat, granting him massive bursts with massive damage.