The Islamic State will shortly issue a new video, the militant group's media arm al-Furqan announced Thursday on Twitter.
The video may contain a message from IS's leader Abu Bakr al-Baghdadi, according to some Twitter accounts close to IS.
It is called "Go Forth, Light or Heavy" and urges Jihad, or Holy war.
"Go forth light and heavy, and strive hard in Allah's way with your property and your persons," reads a verse from the Koran which al-Furquan posted to Twitter.
Baghdadi was reportedly injured in March during an air raid by the US-led coalition that has been carrying out strikes on IS positions in Iraq and Syria, and has not been in day-to-day control of the group.
New questions about IS’s leadership were raised on Wednesday when the Iraqi defence ministry said the group's second-in-command Abu Ala al-Afri was killed in an airstrike on a mosque in the northern city of Tel Afar.
Britain's Guardian newspaper in an article on 21 April quoted 'a source in Iraq with connections to IS' as saying Baghdadi suffered serious injuries during an attack by the US-led coalition in March.
Two officials – a western diplomat and an Iraqi adviser – confirmed the strike took place on 18 March in the al-Baaj a district of Nineveh in northern Iraq, close to the Syrian border, the paper said.
US officials were unable to confirm the Guardian report, according to a spokesman for the Pentagon, which claims not to know of Baghdadi's whereabouts.
