Based on an early reports by Ryan From CybernetNews, Opera 9.5 will have a lot of new features in their next release (they planned to release alpha version on Tuesday, September 4). Not only the speed, but also the compatibility to the web standards and also performance. Here's the list of updates related to the rendering machine:
* A lot more CSS3 support, including complete Selectors
* AJAX compatibility has been improved
* Improved HTML table layout algorithm
Most of this information has also been published by Opera Desktop Team on their blog. I think it's quite a big improvements on Opera, mostly the URL search capability. Check the video guys and you will (most likely) be impressed with the new features that Opera will bring in Kestrel (codename for Opera 9.5).