It opens in the USA on August 26th, though the French will get to see it a month earlier, when it'll open in theaters in that country on July 27th.
There were some even earlier preview screenings in France that were to have taken place on June 27th and 28th., 2 weeks ago, but I haven't been able to find any reviews online yet, from those who attended.
As we already know, Zoe Saldana stars as a vengeful killer on the hunt for the murderers of her parents. The film is produced by Luc Besson, with Olivier Megaton assuming directing duties.
Check out the just-released 2-minute clip below of Zoe in action. It's is in French by the way, though there's very little dialogue, and it really should be obvious what's going on, without a translation.