Please, rendering technology was the heart of the browser and now it's been flushed down the toilet.
So? If said technology was frustrating to work with (which we now know it is because they have to spend far too much time doing boring things like patching sites that keep breaking), then replacing it will boost morale.
How will it innovate? How will it differentiate? By creating a different set of icons on the toolbar?
So basically, the way Opera "innovates" and "differentiates" today is to be far less compatible with websites than Chrome?
Of course not. It differentiates with its features and user experience. The user interface, not the engine. The engine is a negative differentiator because it doesn't work on many sites.
Look at Dell (basically sticking their logo on sb's else hardware) vs Apple which actually innovated and designed stuff.
What makes you think Opera won't come up with new and unique features? Does switching to Webkit suddenly mean they lose that ability?