No. Currently the concept art you are showing is all of the Guardians who will be used for the movie. The team includes Drax the Destroyer, Groot, Star-Lord, Rocket Raccoon and Gamora. Drax and Gamora are indeed members of the Guardians; Thanos, Ronan the Accuser and Nebula also make an appearance as the primary villains.
There was no indication why Quasar or Adam Warlock were not included, but likely the answer is a superhero team that is too large may be difficult to deal with on camera. Consider all three of these heroes has the potential for complex visual effects, where guns and martial arts are the mainstay of the current choices. The visual effects for Groot and Rocket Racoon will be relatively simply in comparison.
At Comic-Con 2012, Kevin Feige revealed the following:
Kevin Feige announced that "Guardians of the Galaxy" is set for release on August 1, 2014. Feige revealed the space-faring super-team will include the characters Star-Lord, Rocket Raccoon, Groot, Gamora and Drax the Destroyer. The inclusion of Gamora and Drax makes it highly likely Thanos, seen at the end title scene in "The Avengers," will be somehow involved in the film's storyline. The god-like super villain has a long history with the "Guardians" in Marvel Comics' lore, but a direct connection to Gamora and Drax. --HitFix > 'Guardians of the Galaxy' will feature Star-Lord, Rocket Raccoon, Groot, Gamora and Drax