Like for the Ninja 300, I see that the policy of increasing the capacity of the engines is back!
Marketing depts use this simple way to attract new Customers but in this way they don't make any technological progress: easy to say that the new version is more powerful when the engine is bigger!
But a bigger engine is also heavier and the bike will require more gas, thus if a progress in made in fuel usage it's wasted immediately after! Bah!
Moreover people who are not that tall or strong will find harder handling a heavier bike.