There are no changes to the regulations until at least the end of 2009.
You have to sit one or the other since you must have completed your theory exams before you can sit your skill test for whatever licence. So, you can either sit the CPLH then do the IR or just do the ATPLH - currently they are considered to be the same in theoretical knowledge terms (LASORS Sect G p 11). That is, the CPLH has the same academic standard as the ATPLH - it's just missing the IR subjects.
Phil