Ok, to clear this all up:
The new GCSEs won't affect you, the new A-Level will. The actual course content in the A-Level, for the most part, is not changing. You can still use past papers (I definitely will be). The AS is a standalone, meaning you will get a separate qualification in the subject if you sit the AS examination even if you take the A-Level examination. The AS grade will not count toward the A-Level grade.
E.g:
I am taking AS Level ICT, Sociology, English Language and English Literature from 2015-2016. I sit AS exams in June 2016 in all of these (you may or may not sit AS exams, depending on your school/college. It is more likely that you will sit them). I get AS qualifications in each subject. I then move on to do A-Levels in either three or four subjects. I sit these exams in June 2017 and gain A-Level qualifications in each subject. I would then, providing I passed all of the subjects, have qualifications in:
AS Sociology, AS ICT, AS English Language & AS English Literature. A-Level Sociology, ICT, English Language & English Literature.