Opera has always been the leader in innovating web-browser technologies and once again the Opera team has came-up with some promising stuff with public release of Opera 10.5 Pre-Alpha, the major new features worth mentioning here would be the all new JavaScript rendering engine Carakan which is touted to be 7x faster in benchmarks then it's predecessor Futhark used in current stable release of Opera 10.10, new Presto 2.5 engine with support for CSS3 transitions and transforms with more HTML5 features, new hardware accelerated VEGA graphics library and support for private tab (no need to open a window) apart from the new address-bar and other GUI enhancements.