As the start of the eighth and final season, this was expected to be something different, something special, never before seen on Charmed.
With the whole of San Fransisco mourning the loss of Piper, Phoebe and Paige, the Charmed Ones have to set up a new life, free of demons and the police/FBI. To do this, they need disguises, but with police inspectors/FBI agents still hanging around, and Paige still hearing her charges's calls, it's difficult to stay inconspicuous, especially when nobody, not even your family and sisters knows who you are.
A spell fixes this, but once again, the Charmed Ones are dragged back to demon fighting.
No the best way to open the final season, but a way to open it none the less.