Can only give an answer based on Butterfly information shown in 2015 vs 2014 catalog.
The Innerforce layer ZLC is 157 x 150, while the old serie was 158 x 152. The weight stayed the same, but this is because the innerforce layer zlc has a thickness of 5.7mm while the old serie was 5.6mm. So smaller blade size and thicker, so probably just a little bit faster, less head heavy and less vibration.
The innerforce layer ALC is 6.0mm while in old serie they said 5.9mm
Cant find any differences in the Innerforce layer AL and the old serie.
So the ALC and AL stayed the same, but the price also stayed the same. There are changes made in the ZLC and that one got a higher price. 189,90 for Innerforce layer ALC, while the old serie was 159,90.