I am about to use it for design prototype for work. As I tested it, I found out the colour between design view and share online result have different colours.
Please check the attached files. I tested with my own file and the examples from adobe.

Allow people to become watchers of a prototype so when the document is updated they could get updates to check it out.

Bonus points if it can highlight what's new.

This would be great because I'm working on something and my manager works remotely and feeding back as i'm working. I'f she and others were notified when it gets updated then it would save me a manual email every time I make a change.

well it doesn't make sense why you can only record the video when someone is on your computer trying out the prototype, and just thinking you should be able to record how someone is using it when they are overseas

I would like share my prototype in some kind of interactive file, that can works without internet and without any other program, something like a interactive video.

Ideally this feature would allow an "export page as PNG" or "export all pages as PNG" function that is available while viewing on the web.

Once a prototype has been shared online, web viewers often need to export full screenshots of specific pages (or all pages). This process currently works fine if the page does not scroll, but does not work if the page is scrollable because part of the page is not visible on the screen.

It would be great to be able to choose the page to view online directly.

When you want to quickly show a certain page in your mockup, or start anywhere else than your designated Home, it can be tedious to click through the prototype as not all the paths are there.
Using the previous/next buttons can be confusing as it depends on how you have spread out the artboards.

For better flow and clarity for the clients, to have artboards names visible at the top of every screen in the public views.

It would be nice if the creator (sharer) of the prototype could add footnotes to the shared prototype, separate from the comments.

eg. if there is a conditional object. this hypothetical object on the page should only be there when the user has a message, I'd like to be able to add a footnote to inform the shareholders on this condition. Footnotes would be used for these function-specific notes, and comments would be used for feedback and discussion.

Include the file name in the shared link to make it easier to keep track of multiple XD prototypes.

Get statistics from shared prototypes to be able to analyse. Clicks, page views, amount of visitors, time spent...

As a designer I would like to share my designs on the web, and be able to jump from one XT project to the other. There are many uses to this capability. 1) Breaking up a project. 2) Sharing a chapter page that can be updated.

I'm currently testing one of my designs in XD.

I've shared my design with some users so they could leave their feedback by using the comment en pin tool.
Those comments are visible for everyone what could influence the users comments by reading other users comments.

I think i would be great if the owner can decide whom can view the comments and mark them as invisible when desired.

Be able to create/manage folders per XD file in the Prototypes view on my Creative Cloud Account.

It is often necessary to publish several versions of the same design for user testing sessions. The idea would be to define artboards basically dynamic in the workflow to export the number of versions (A / B) of the prototype.

ピン留めしたコメントをクリックすると、ピン留めした位置に移動してほしい

ピン留めしたコメントがどこに該当するかすぐ確認できるように、コメントのピンナンバーあたりのクリックでピンされている位置にスクロールしてほしい。
その他、ピンのカラーバリエーションもあったら良さそう。

Translation:
Please scroll to the pinned position by clicking on the pin number of the comment so that you can confirm immediately where the pinned comment corresponds.
Otherwise, it seems to be okay if there is color variation of the pin.

Automatic update on Sharing URL when we made changes on mockup