There are some rumours about Soundcloud integration, the new synth "Padshop" and other stuff... But this update will not be for free.
Some quote from the Steinberg Forum from Helge Vogt (Product Manager Steinberg).
Helge Vogt wrote:The good news is: 6.5 brings a host of useful and great sounding features, and you'll love it — just like we do. But yes, it won't come for free - it simply can't.
However, we are confident that this is a fair deal - consistent with our philosophy. In less than 24 hours you can make your own judgement - when we reveal the full picture