It said the redesign was "imminent" but refused to be drawn on further details.
According to Sun Online editor Pete Picton, the site's new community feature MySun has been an "instant hit" and readers' contributions have helped to make it Britain's "best-read" website.
Sun Online today released its audience figures for last year, claiming it also generated 1.2bn page impressions during the whole of 2006.
The site was audited by ABC Electronic in January, April, August, September, October and November 2006; it is awaiting December's figure. It is now audited every month, as are The Times and The Guardian, according to News International.
There have been previous disagreements within the newspaper industry due to non-standardised traffic figures. In November the Daily Telegraph editor Will Lewis claimed Telegraph.co.uk had overtaken The Times and The Guardian's sites in unique users according to Hitwise figures, but The Guardian, citing its ComScore figures, rejected this.
Sun Online has received extensive investment, in contrast to the online properties of rival tabloids.
Rupert Murdoch's new-found enthusiasm for the internet led him not only to buy the social networking site MySpace in 2005, but also to sanction Sun Online's first redesign for five years in autumn last year.
The redesign introduced some of the web's more cutting-edge features such as video, podcasts, RSS feeds, blogs and a mobile site.
Print favourite Deidre's Photo Casebook was translated into video and attracted 20,000 downloads on its first day.
Picton said commercial products such as Sun Bingo, Diet, classified section Sun Local and Singles had been a success.
He also praised the contribution of his journalists, picking out the story that Gordon Brown's baby boy Fraser has cystic fibrosis as one broken by the site.
In December, ABC Electronic announced that its main measure will be changed from page impressions to unique users.
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