According to one of EX3's hair stylists there are only 7 days left of shooting. The Expendables 3 was initially planned to be in production for 10 weeks in Bulgaria. Filming started on Aug 19 and should wrap towards mid/end of next week.
Jovovich, Chan and Rourke are mentioned again by a Bulgarian news outlet. According to Standart "since last Wednesday Gibson is filming on the set of The Expendables 3. Former Mad Max Gibson is going to join in as the villain in the action blockbuster along with co-stars Jason Statham, Sylvester Stallone, Arnold Schwarzenegger, Milla Jovovich, Jackie Chan, Mickey Rourke, Dolph Lundgren, Wesley Snipes and Antonio Banderas."
Finally some details of the final battle revealed by this Bulgaian news outlet: Gibson is filming his scenes in Sofia's Royal Palace where his final fight with Stallone will take place.
Spoiler (Stallone will apparently enter the Palace through the roof, and after killing Conrad's henchmen he'll get to Gibson and kill him in the final fight).