I never saw anyone other than Quigibo use Delta or Gamma instead of Beta and Alpha before, though...
That's because its not standard practice, its kind of just an inside joke to extend the releases past beta.
:O It's not that serious, though.
Ah, I see now 
I guess it's kinda like Wacky Fun Random Numbar Generator v1.00000069. 
On the other hand, this is a serious matter and v1.00000069 is the real version, it's not funny at all.
EDIT: LOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOL
