I agree it's a change though the old definition seemed to be straight from FCL-1 and was fixed wing based. As helinut says, FCL has no bearing on how many hours you can fly; that will be defined in OPS-3 subpart Q when they finally agree a scheme.
However, I fail to see how the new definition would increase the number of hours you can fly: for any given limit it would result in fewer actual flying hours when compare to the current CAP 371 definition (a/c first moves for the purpose of taking off to the time the rotors finally stop).
What may be afoot is to introduce a scheme with higher limits than some existing national regulations, to apease those other nations with very high current limits, but with the new definition of flight time the result would be actual flying time values not so different from the current more stringent schemes. If that makes sense! The reason there has been no agreement so far on subpart Q is that there are hugely differing schemes presently in force within the JAA member states and not all countries agree that our 371 limits are commercially practical. A stale mate has ensued (as far as I understand it)