A while back, when I finally decided to preorder the Göttingen
Septuagint from Logos
before
the initial, pre-publication special ended, and when I did so, I was
quite prepared to wait several years before this resource actually went
through and came out of development. Yet, earlier today, I happened to
stumble across this on the Logos
website: 
So, rather than a couple
years, the Logos
edition of the Göttingen Septuagint is apparently just over a couple
months away (!).