What is the most probable date of the next major redesign of Macbook and Macbook Pro?

[KensaiMage]

What date is the most probable according to the past redesign releases?

Date for redesigned macbook
Date for redesigned macbook pro

If I’m not mistaken, apple should redesign macbook in 2019, is that a high possibility? How about the mbp?

 

[New_Mac_Smell]

Every 4 years on average, at least for the past 10 years. Wouldn't expect that to change.