as we are getting closer to the end of the year I hope to be able to release the first unity client latest by next week
story wise there will be no major change or new content, except some streamlining in the prolouge
engine will be a logic dictates unity ;)
graphics wise i have finished upgrading all backgrounds of the prologue and chapter 1 and i expect also chapter 2 and with a lot of luck chapter 3 will be done as well by the release date. characters videos of the upgraded characters and the legacy in those chapters will also be updated/normalized.
the only legacy content will be the beginning of the opening video as this will take at least 36-48 hours of rendering time :(
But I m confident that by end of the year the whole upgrade process will be completed (at least of those character that can be upgraded at this point in time. Unfortunalty I m still missing a few important bits to complete all) and I can finally continue with the next chapter. 
Maybe I ll drop a teaser inbetween as the first shot of the Chapter 5 is already finished for some time.