Abu Adam had appeared with his brother in a video released last January.
The 14-minute tape is entitled "God's Soldiers" and was released by the group's media wing Jundullah Studios. It also contains footage of fighters from other countries, including Turkmenistan, China, Russia and Tajikistan. One of the members shown looked as young as 14 years old.
This tape also included shots of some operations undertaken by the group and the aftermath of the attack on the NATO supply trucks depot in Peshawar, as well as pictures showing Orakzai Commander Hakimullah Mehsud driving a stolen Humvee with some of his men sitting on the roof of the vehicle.
It also included footage of the aftermath of the attack on the German embassy in Kabul back in January.
There were also shots of the Jundullah Studios, where the group's editors were shown working diligently at their computers.
The Islamic Movement of Uzbekistan (IMU) was formed in 1998 by former Soviet paratrooper Juma Namangani and the Islamic ideologue Tohir Yuldashev, both Uzbeks from the Fergana Valley. Their objective was to overthrow President Islam Karimov of Uzbekistan and create an Islamic state The group is known to be an al Qaeda and Taliban ally, fighting in pockets along the Afghan-Pakistani border.
Videos recently shown by the group reflect a greater involvement of operatives from Germany in the group's activities.