These are good questions, but you're really putting the cart before the horse. First you need to file under the DACA program, and then be approved. If your application is approved, you may then be able to apply for advance parole. If parole is granted, you should beable to travel without concerns. As to future DREAM Act possibilities, we'll all have to wait to see if the DREAM Act ever gets passed, and if it does, what it actually says.
I would also strongly suggest that you consult with an experienced immigration attorney before filing an application for expert assistance and guidance.
This answer is of a general nature and should not be relied upon as final, nor is it intended as legal advice. A consultation with an experienced attorney is always the best way to go.
I do not recall anything in the upcoming (August 15) "DACA" giving applicants the right to apply for and obtain an Advance Parole.
As to any future "DREAM" Act, well, we are not there yet... I don't want to speculate.
I agree with the other attny. First focus on getting DACA. If DACA is granted, then you may apply for advance parole. Only once permission is granted may you travel abroad.
Best of luck!
This is not legal advice. No attorney client relationship exists between us.