First public release. On phone-sized screens (600px wide or narrower) on old.reddit.com, and on www.reddit.com when the account uses the old design:

Fits the page to the screen width: no sideways scrolling, and titles and comments wrap.
Sticky top bar with the page name and a ☰ menu: Home / Popular / All, account links, other feeds, subscribed subreddits, a "Use subreddit styles" switch, and the subreddit sidebar.
Sort tabs in one row you can swipe sideways.
Posts: larger vote arrows, 64px thumbnails and full titles. Secondary actions are behind "⋯".
Comments: compact indents with a coloured line per level; tap a line to collapse the thread. "Reply" stays visible and the other actions are behind "⋯".
Hides the "Get new Reddit" button and the email-verification banner. The top reply box becomes an "Add a comment…" button, and AutoModerator's pinned comment starts collapsed.
Subreddit custom styles are off by default (switch them on in the menu).
No data collection, no network requests. The only stored setting stays on the device.