Narrated Abu Huraira: Allah’s Messenger (ﷺ) said, “The Hour will not be established till two (huge) groups fight against each other, their claim being one and the same.”

Sahih Bukhari
Reference: Sahih al-Bukhari 6935 (Apostates)
In-book reference:Book 88, Hadith 17

Reference  : Sahih al-Bukhari 6935
In-book reference  : Book 88, Hadith 17
USC-MSA web (English) reference  : Vol. 9, Book 84, Hadith 69
  (deprecated numbering scheme)

Is it talking about Muslims and Mujahideen? I think so, 99% possiblity. Allah knows best.

But where I fit in, where I belong to, what’s my role in that? Is it happening now between Al Qaeda and IS? Or Is it talking about the fractions within these groups of Mujahideen or is ther any future group from a near future? Allah knows best. May Allah unite them against the known enemy, kuffar, the munafiqun and the mushikun (Taghut). And may Allah make them to be easy on the believers who stand for Salat at night. May Allah guide them, protect them. Ameen.