If your YouTube homepage is showing videos in a list view (instead of a grid) this is not an intentional change and we're working to fix it! Thanks for all of your reports, and we'll share another update when the issue is resolved.
Hello there – most channels hear back in a month or so. Each application is manually reviewed, so it does take a bit of time. In the meantime, here’s a bit more info about the review process: https://yt.be/help/YPP-review . Hope you hear back soon!