The SITE intelligence group said the al Qaeda leader will discuss Iraq and the group the Islamic State of Iraq, a longtime foe of the Iraqi government and U.S. forces.
SITE, which provides counter-terrorism information to government and private groups, said the announcement of the impending message was posted to Islamic militant Web sites Thursday.
The posting said the message - titled `The way to contain conspiracies" - would last 56 minutes. It did not say when it would be released, but such ads usually precede the actual message by one to three days.
The authenticity of the posting could not immediately be determined. But SITE said it was signed by As-Sahab, the production branch that releases al Qaeda messages. The Internet message did not say if bin Laden's statement would be in a video or just audio form.
The message would mark the sixth public statement by the terror leader this year. Audio or video communiques were sent over the Internet on Sept. 7, Sept. 11, Sept. 20, Oct. 22 and Nov. 29. A video on Sept. 7 was his first in three years and was issued to mark the sixth anniversary of the Sept. 11 attacks.
Al Qaeda has dramatically stepped up its messages - a pace seen as a sign of its increasing technical sophistication and the relative security felt by its leadership.
The terror group has also been campaigning to reach a broader audience, announcing that its No. 2 figure, Ayman al-Zawahiri, sent over the Internet. The deadline for the queries was Jan. 16.