I just downloaded the latest beta and I'm really quite impressed. Everything seems way faster (or at least more responsive), scrolling is far smoother than it ever was before, and the new UI seems great so far.

Some changes I noticed just now while browsing HN:

- Double tapping now seems to cycle through 3 zoom levels

- Article/body text is automatically recognized and set to a readable size

- Comment links are much harder to hit, my taps seem to always hit the article links unless I pinch-to-zoom in very close