Your only options are to:
1) As you say trawl through all P1/P2 past papers and look at them along with the pilot paper.
2) Buy a tuition providers exam kit where they have adapted to the new syllabus for you (to a certain extent)
This is made much more difficult with the change in mark allocations. It would be worth buying an exam kit since the past papers wont help overcome this. Some topics will be examined for 10 marks instead of 4 for example.
Its slightly easier for me because im sitting both P1/P2 together (and E2) so i will be going thru every exam paper from 2005-2009 for both papers anyway as well as an exam kit with extra examples just treating the both of them as one massive exam.
