Choose File means you can insert an image into your post.
There are already a few topics where we've been able to do that for ages. But this is new for all topics (I assume) - although I think it's only available on the App/Mobile sites, it's not available on the Desktop site yet.
I don't like it either The font looks stupid and childish now whereas the spacing was neat before.
Font and spacing look ok in Chrome and Firefox on a Mac, can you tell me where it looks different? Which device are you using and which browser? We know classic has changed a bit but we'd like to know if it's elsewhere too.