Let's get it over with: Jagged Alliance: Back in Action is not turn-based! Instead it uses a custom-built version of the well known and generally totally mediocre (read: mass market compatible) real-time with pause (RTwP) called „Plan&Go“. Everything happens simultaneously. There's no fog of war. All enemies can be seen as soon as you enter the sector, only enemies inside a building are displayed as one bigger cluster representing an unknown number of troops.
So much for the bad news. Here is the good news: Plan&Go works well and it's not primitive at all. The player not only has a lot of control, he actually should pause the game to plan his next steps and coordinate his squad members. Going into RTS auto-pilot and casually shuffling mercs around will lead to a rude awakening. JA:BiA is neither an RTS nor an action game, it's still a tactical game which requires slow and careful play. A hasty course of action will lead to frustration. Effectively, the RT in RTwP will only be used to move quickly from A to B.