The UN investigation team still needs time and wont be done before Lahoud’s mandate is over.
This new report provided progress on several aspects, i havent read the report yet but read several articles from different papers.

Three motives were identified by Brammertz as being the prime ones behind Hariri’s assasination:

The political implications of the UN resolution 1559.
The Extension of Pr.Lahoud’s mandate.
The personal and political dynamics which existed between Hariri and other political parties and leaders in Lebanon, Syria, and other countries.

Brammertz said “all of these factors came together and were handled by Hariri, sometimes proactively, and sometimes in reaction to events around him.”

From Naharnet

Click here to read the full report.