My top requested features (in no particular order).
I won't even mention the white label option and E-Commerce, since those are in the works, but here some other things that I would be a great to have integrated.
Contact form submissions that reply to the actual sender rather than to webflow.
Icons. Icons. Icons. I say this not only to stress that we really need them, but also because we need LOTS of them. I'd like to see various libraries.
More drag and drop modules. This would greatly speed up the layout creation of a new site. The main one I want is an accordion. For example, an accordion would be very helpful when creating FAQs.
True parallax. Personally, I find CSS parallax much less appealing.
DWP (Dynamic Website Personalization). This is an amazing feature. As a reference, check out Duda's InSites.
Color overlay. I hate having to go into Photoshop or a similar software program to add a color tint overlay to an image. Having it in webflow will allow us to change the color overlay on the fly.
Background video. It really makes a website stand out (well, that is if the video is sexy).
I'll add to this list as I think of them. Some of these others have highlighted too, but perhaps the more people that are wanting the same features will make a difference.
UPDATE: Added numbers 6 and 7.