I'm not with you - we haven't altered the way the threads or posts are presented. The date order is still the same as it has always been, and the threads work in just the same way. We've simply altered the appearance, and made the site run faster.
A major problem in the past was the way that the site periodically hit a wall - everything slowed to a crawl at times. We're pretty sure this isn't going to happen now - everyone can surely see how much faster the forum is.