According to Billie Piper in Doctor Who Magazine, she is not going to rule out ever returning to Doctor Who as Rose. However, It seems very unlikely that she will return in series 5. Billie Piper has many other work committments, as well as a baby on the way.
No.
She's going to be in one of the Christmas specials, as Rose before she met the Doctor.
No she is not coming back.
No, Rose will not be back in series 5, she is probably gone for good now.
No, she has left for good.
Yes, Rose returns from the parallel world at the end of episode 12, at the end of episode 13 The Doctor returns her and clone Doctor to her world to live their lives together.
Rose and the clone Doctor kiss in Journey's End (series 4 episode 13). Although Rose and the real Doctor have kissed, Rose was possessed by Cassandra at the time.
Yes, he does still love her, but it's too painful to say or admit it, if he does he will still have to watch her leave. Him and his double both know it's best if the clone says it because he's going to be with rose anyway, but yes he will always love rose.
The 9th Doctor, Jack kissed both him and Rose before going off to fight the Daleks in The Parting of the Ways.
Yes, K9 will return to Doctor Who on the fourth season finale, accompanied with Sarah Jane, Rose, Martha, Donna, Captain Jack and his team, and Harriet Jones.
Rose and the half human Doctor are still together living in a the parallel world, Rose and the real Doctor were never together.
There are several moments in the Doctor Who series that are sad and tragic. One such moment was when the Doctor (Matt Smith) sacrificed himself to save the whole Universe resulting in him never existing at all in the "The Big Bang" Season 5 Episode 13 (2010). Another is when Rose Tyler became trapped in a parallel universe and beyond the reach of even the doctor in Season 2 finale - Doomsday (2006). Losing Rose was probably the worst moment for the doctor (David Tennant).