Futon Critic has the information of ABC’s Fall & Midseason schedule since it was accidentally released on the ABC media site. Therefore, I can confirm that Happy Town is Midseason, and since Dollhouse is returning in the Fall, this suggests that Amy may well be able to have a recurring guest spot on season 2! I can also confirm that Amy is a series regular in Happy Town so we will get at least one weekly fix. :)
I’ve also come across the very first cast photo for Happy Town (Amy looks lovely!) which has been added to the gallery; a smaller untagged version courtesy of Futon Critic & a tagged version courtesy of ABC’s media site. Here’s hoping HQ versions shall be available soon. A preview is to your right and the gallery link is below, enjoy!
EDIT: HQ versions have been added, including a solo shot of Amy. Enjoy! :)