More YC companies public pre-Demo Day - thoughts?

By my data (http://www.seed-db.com), with 24 hours to go before Demo Day 38 of the 53 YC companies in S13 have launched and/or are public (72%).

This is up from YC W13 where 28 of the 47 YC startups were launched/public the day before Demo Day.

Any other observations/thoughts about the evolution between batches?