It is the right PyQt, but for what ? If you want aarddict, just use the install link above by itkach (you don't need to explicitly install PyQt, installing aarddict will do that for you automatically).

Just have enough rootfs space to be able to take on the grunt of Qt + libicu

EDIT: As for the libicu in extras-testing - as it's a generic lib it will go to extras when an app using it enters extras.