Yes. We'll refresh it when the reader visits one of the items in the top-level collection.
I'll note though that I don't think this is working quite right in the iOS app, and I need to ask the team to look at it. My demo app for this morning's launch isn't showing the image for some reason. Doh!
Here's the behavior I isolated with Preflight-enabled apps built today (14 Oct):
- Upload a new brand image, click Save, and go to Contents & Layouts
- Click the Preflight button and allow the progress bar to finish.
On iOS: Force quit and relaunch the app to see the new brand image.
On Android: change views to trigger the Update message, update and you'll see the new brand image. N.B. I found that I had to click on an article or collection to go "one level further into the app" to get the update message rather than switch to another top-level item.