Will Viz ever release season 6 to the current episodes?

[Uzumaki Gyo]

I live in the United States and Viz does the dubbing for the series in English.

[A.Haibara]

First of all, Viz does not dub the anime- they translate the manga. What you are probably referring to is FUNimation. As for that, they have stopped dubbing ages ago due to low ratings (or something or rather). 

But I don't mind since I prefer the sub anyway

[Akazora]

You're going to have to watch fansubs if you want to catch yourself up on the anime, or read the manga if you want to save yourself some time.  As much as I like to support my interests legally, it's rather difficult with a series like Detective Conan.  I have a few Conan figurines that I got for dirt cheap in China, but that probably translates to something like $0.009 in Gosho Aoyama's pocket.