With Microsoft Advertising adCenter now providing all paid search results for Yahoo! Search and Bing in the US, and Bing supplying the organic search results for Yahoo! Search, they have just announced that this will be rolled out in select markets across europe and the UK in early 2011.
The european transition will begin with the UK, France and Ireland with all of europe expected to be completed by early 2012.
Current advice is to continue using adCenter as normal but to expect further information regarding the pending changes approximately 3 months prior to any changes taking place.