- In v1.0, you will add new buildings for Islamic Factions ?
yes there, will be new buildings not necessarily for Islamic factions....
- You will continue to develope Chivalry on Rome : Total War, or you will go to M2TW ?
Rome : Total War, yes but minor tweaks, changes, and bugfixes.... M2TW, its very unlikly, yet again there already is something like chivalry 2 for M2TW, I suggest
The Sicilian Vespers mod, its lead by a former Chivalry leader and its being made a lot like what Chivalry for M2tw was planned to be like, even our mod leader Davinci is doing some behind the scenes work on it. 
- You will add others features ? Like a "Jihad" for Islamic Factions, or other ?
Chivalry tries to stay on the realistic side, there wont be any "Jihad" or any unhistorical crusades. its just gonna be holy region crusades, Baltic crusades, and creation of the Latin empire as far as special wars are concerned. The problem with Jihad is that there was really only one done in this time frame and it was against the crusaders in the holy land, and since this is the rtw ai we are talking about you cant really expect ai crusading factions ( England, France... ) to actually sail an army to conquer settlements on the other side of the map...