NEW FEATURE: Team news authoring in the SharePoint mobile app for iOS

Replied inline. Let me know if they make sense. 

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A couple questions/comments

1. When creating News, each news item creates a new Page on the associated SP site
- When that Site is created from a Group or Team, by default those pages are not exposed. Is there a method to display new News items on a main site page and not have to click through to Pages?

Good question. In either classic team site, or modern team site (every group gets a team site, which will be modern team site), you can add a modern page, and add "News headlines" or "News list" web part to the page. These two web parts will be querying the site's page library and display news posts available in the site, in reversed chronological order. As a matter of fact, newly created modern team site already has "News headlines" web part in the site home page, by default. It looks like this: 

- News items are not displayed within the UI of the Group and there is no indicator that there is new News. Is there a way to get an entry into the Conversation component of the Group?

By saying "Conversation component of the Group", I assume you mean the group conversations in Outlook's UI? We don't surface team contents there. As I mentioned above, you will get team news showing up out of box, when you go to the team site experience of your group. Let me know if you couldn't find it. 

- Is there a way to bring "News" articles into the new Team app interface for the associated team? either as an entry in the Conversations or as a new tab called News

What is "the new Team app" you are referring to? Microsoft Team? Assuming it is what you meant - we don't have immediate plan on surfacing news there yet, but we could definitely expand news surfacing area by allowing you to easily click and share to team conversations/discussions in the Microsoft Team app. 

2. Notifications: the moble app notifies you that there a new News items.
- Do we now have to set up notifications on the library for users who are not using the mobile app?

Currently, there is no notification capability when there is a new News item. We are working on the notification system for the app. Once it is done, users who use the mobile app will get notified when certain news items are published (we are working on the threshold and scenario here);and users who are not using the mobile app will likely need to be notified in other ways, e.g., via Email. We don't have a clear plan for the latter part yet. 

- This goes double for users usingt Groups or Teams

Not sure what you mean by this. 

3. Any Best Practice around creating a new Library of Pages called News?
- If you are alreading using the library "Pages" and now new items are coming in as News, this information can be incorrectly interspered within the library (and all of its assoviated views and filters). When creating "News" articles, would it be better for them to be created in a new, dedicated library?

It is an intentional decision for us to have News items in the same library as other pages. We view news post as just another page, but with certain parameters that distinguish them from other pages so we can build UIs that only surface news items back. We are playing with the idea that in the future, maybe any page can be "marked" as news worthy, and get distributed through news UI. Thus, we don't go with having a separate library for news. It should not be hard for you to filter out news items in a page library, using values in specific columns. What is your scenario on making sure they are not mixed?

4. What is the assumed permission of the library within the Site? Does it inherit the permissions of the Site? or does it set its own permissions based on assigned users to the Group (or Team or Yammer Channel, etc)?

It inherits the permissions of the site, which will reflect assigned users to the Group, if it is a modern team site. 

Alina Skarbovsky might have more insights to add here.