1. Jakku was deserted until a massive battle caused the Star Destroyer we saw in the teaser to crash.
2. Max von Sydow was the commander of the Star Destroyer and his crew were the first settlers on the planet.
3. Sydow is angry at the Empire/First Order for abandoning him and his men in the aftermath of the Battle of Endor.
4. Sydow provides help to Rey and Finn before they leave the planet.
5. Because of the scavenging potential Jakku has become a hive of scum and villainy like Mos Eisley.
 



The reddit user also posted some information on Kylo Ren’s backstory, referring to him as the equivalent of the “false idols” that plagued the Early Medieval European church. Kylo Ren is claiming to be Darth Vader and through his use of the Force more and more members of the First Order are starting to believe him. In the film Kylo makes a power grab to take control of the First Order and his brutal tactics are part of what leads Finn to desert.

http://www.starwars7news.com/2015/04/rumor-details-on-the-new-planet-jakku-from-the-force-awakens.html

is this the new GI Joe?

No, Guardians of the Galaxy II.