The updated version will include an implementation of tabbed browsing allowing users of IE6 without Windows XP SP2 (& IE7) to benefit from tabbed browsing in Internet Explorer. Internet Explorer 7 is set to debut in beta form this summer with various improvements including tabbed browsing, inbuilt MSN search and an RSS aggregator, however, IE7 will only be made available for customers using Windows XP with SP2.
It's not year clear when the new toolbar will be available and at time of writing an MSN Spokesperson said the following:
Since the launch of the beta in December, we are thrilled with the strong consumer interest we have seen. We continue to receive constructive feedback both from consumers and internet enthusiasts, which will help us deliver an industry-leading final product. Feedback topics range from accuracy of search results to suggestions on possible new features. We will continue to incorporate the consumer feedback we receive and we hope to ship the final product in the next few months. We are getting great feedback from beta customers, and continue to improve the product, and are committed to shipping a great solution for consumers when it is ready.
We'll keep you up to date :)
Update: screenshot removed at the request of Microsoft.