Update 4/30/17* The new patch is coming out at an undetermined time as of now. Click here to find out why.
Developer Comments: The initial change to Hyakuretsukyaku was made so that both legacy players and new players could input the command for this attack as they saw fit. Unfortunately, for some players who press buttons repeatedly either in block stun, hit stun or during combos, this sometimes led to accidental inputs. To alleviate this issue, the number of K inputs has been increased.
- Hyakuretsukyaku (Normal/V-Trigger)
- Changed the number of necessary inputs when rapidly pressing K from 4 to 5
Source: Capcom Blog