Does anyone know the approximate release date of V6?

No but Stefan has been working on it recently so maybe he'll keep focus on it and finally get it ready for public release, it's fairly close.

i also have slowdowns on my laptop (which is a midrange laptop that comfortably runs HoN on low-medium settings) as well, havent found out why though.

I have been having this exact same problem as well. I have tried everything in this thread but have had no success with solving the problem.