It will be released before the end of 2008.
Come of its features are state-of-the-art applications such as modern web-browsers, productivity software or digital imaging software typically operate on large datasets with a corresponding memory footprint which rapidly outstrips the physical memory of any computer system. Amiga OS 4.1 offers intelligent memory paging and uses transparent disk based memory - but only when you need it.
More info here: http://www.hyperion-entertainment.biz:80 80/amiga