1 - above all else, ARA support! so we can have instant drag and drop audio to midi tracks and direct melodyne integration, because everyone else will have it soon, it's a workflow changer.
2 - better freeze workflow or alternative (see Studio one2 for a better alternative)
3 - a single window workflow, at the very least being able to have the drum editor and mixer docked in the project view. (edit in place is a joke)
4 - more drag and drop implementation.
I already have enough 3rd party plugs so if it doesn't have most of these things I'll just keep working with studio one 2 like I've been doing, I'm enjoying it immensely.
Bonus - I know it will never happen but the ability to authorize a laptop without a dongle.