Here you go, a list of some Opera 10 features and known facts.

Opera 10 alpha will be ready till the end of this year.

Opera 10 will include auto update.

Opera 10 will have an inline spell check.

And besides that, well known changes:

New interface: redesigned skin.

New rendering engine: more performance, less compatibility issues, stability.

More applications that runs outside web browser.

Increased security.

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