WW,
I believe legacy rules apply, i.e. if you're already in the system the old rules will apply if you would be penalized under the new ones, and no doubt you are old enough for this not to be an issue for you personally, however......
My understanding of the new PAS pay spine is that Flt Lt pilots (as well as navs) will in future be limited to level 30, with Sqn Ldr Navs being able to reach level 33 and only Sqn Ldr pilots getting to the very top of the spine.