Please watch this video. Yes, Pope St John Paul II did say that we may entertain a "hope" that these children would be admitted into heaven. However, "hope" is not "certitude". This is a topic of concern for me, as I am in front of abortuaries most Saturday mornings to persuade the mothers to give life to their children - and a chance for them to be baptized.
I have seen pro-lifers commit serious errors along these lines. The first is the presumption that aborted babies will automatically participate in the Beatific Vision. Some have even opined that we on the sidewalks need not make these babies the primary objects of our concern, but to do that for those participating in the abortion. That is irresponsible hogwash. The adults who are participating in the abortion have the ability to repent. The unborn child is completely dependent on others for his/her entrance to heaven. The babies will get first dibs on my efforts.
The second error is one from an opposite perspective. Here the pro-lifers understand the need for the babes to be baptized, but also lament that they cannot perform the baptism themselves. So they have concocted a parody of baptism, believing or wishing it to be efficacious. That is, they kneel and pray in the direction of the mill. They perform the baptism ritual and sprinkle holy water in the direction of the slaughter house. Best wishes and motives aside, that is NOT a valid baptism. The water must come into physical contact with the child's body in order for the sacrament to be valid. Remember: matter, form, intention. All must be present and in good order for the sacrament to be valid.