If I were to start a wish list of things I'd like in DS 5 I'd say I would like better backwards compatibility and a faster render engine.  I'm running 64 Bit DS 4 Advanced and it takes a long time to render a full resolution, print quality image--so long intact that I start it at bedtime so that it will fully rendered when I get up in the morning, instead of waiting an hour or more.  But to be fair , Vue doesn't render any faster on my system.  I would like to upgrade my i7 Processor some day, I'm sure that would help.  Mine is a 2.64 ghtz i7, first generation, which was expensive and almost top of the line when I bought it--now they're I'm the 3.3 range or higher.