It is confirmed. The season four premiere will air on September 27th, and will be a two hour long episode (this date is for the USA).
Piper and Phoebe will be grieving over their sisters death, then Paige shows up. The writers want Paige to bring a fresh start and plenty of energy. In the beginning they'll be there'll be friction between them. Piper and Phoebe are stunned at Paige's existence, and Paige will have a little difficulty using her powers for good, and not personal gain, and she will have trouble adjusting to following their Wicca, and household rules. Her character will probably be careless, and she'll have to learn the hard way that she's not invincible, somewhat like Phoebe's character as the youngest used to be. Piper and Phoebe will have to come to the rescue many times before Paige starts to learn to control her powers, but this will help them bond as sisters.
Paige's powers should be similar to Prue's, but since her father is a white-lighter, they'll be differences.
After a few episodes, Paige's boyfriend will be introduced. One name mentioned is Adrian Gremier, who co-starred with Melissa Joan Hart, in Drive Me Crazy.
It's looking like Phoebe might get a new, possibly active power. Since she is no longer the youngest, her powers will strengthen. Piper will be the strongest. 
Returning Series
One Hour Drama
Thursday 9/8c
For three spellbinding years, the Charmed Ones - Prue, Piper, and Phoebe - have used their witchcraft and the "Book of Shadows" to keep themselves alive as they save innocent souls and fight the darkest evil. Now, this season, the unthinkable will happen. The power of three will be broken forever.
So begins a new chapter in the CHARMED saga as the surviving sisters search for a way to stay alive and strengthen their fragile bond while they continue to vanquish the diabolical. The sisters find renewed faith in the form of an unexpected revelation: there may be yet another Halliwell offspring they never knew about - one who could reunite the power of three and return these virtuous witches to their former glory. They'll find that fighting the good fight is a deadly occupation, but one they were born to do.
From executive producers Aaron Spelling, E. Duke Vincent, Connie Burge and Brad Kern, with Spelling Entertainment. 
Alyssa Milano
Phoebe Halliwell
Holly Marie Combs
Piper Halliwell
Brian Krause
Leo
Julian McMahon
Cole |
