(adds Annan, details)

NAIROBI, Feb 8 (Reuters) - Officials from Kenya's government and opposition said on Friday that talks to resolve their dispute over President Mwai Kibaki's re-election had moved forward but not reached a final deal.

"I don't think it's really going to be a breakthrough, but rather an agreement of principles," a senior government official told Reuters.

An opposition leader, William Ruto, said: "There is positive news, but no final solution yet."

Asked about local media speculation that the two sides had agreed to share power in a government of national unity, Ruto said: "I don't think so. That is not the case."

Sources on both sides said they would not divulge details of the talks' progress, but that mediator and former U.N. boss Kofi Annan would announce more at a news conference.

Having agreed principles to stem violence and help refugees, negotiators for the two sides have been stuck this week on how to overcome their differences on the tallying of votes from the Dec. 27 ballot. (Reporting by Bryson Hull and Andrew Cawthorne)