So I presume the version number would be 4.0.1, right?
It should be Seven, and you can expect weekly updates and bug fixes
Oh, no fun at all.
We'd want updates and bug fixes every year on the 1st of April and then add an alpha character to that year's version.
Next year would be, 4.0.1A; next 4.0.1B; and so you have 24 years before you have to figure out your next set of version designations.
Of course, my first inclination was not to use three numeric characters, drop the '0', but then I realized we need to to sort of follow the phpBB style.