TV company BSkyB is in talks with a private Abu Dhabi investor to launch a round-the-clock Arabic language news channel under the Sky News brand. The new channel, which could launch within 24 months, would be run as a 50-50 joint venture, providing coverage of news across the Middle East and North Africa and competing with the likes of Al Jazeera, BBC Arabic and Al Arabiya. Here are some facts about the leading Arabic news channels in the region: __