Granted, it has no bearing on the movie - Crossroads doesn't even come out until December, whereas Let Me In is set for October - it's just a nagging reminder of all the reasons people dread Americanizations. The American entertainment industry tends to over commercializes things and, in the process, over explains things. Sadly that looks like the course that John Ajvide Lindqvist's original novel may be destined for as it becomes a part of Americana.
As for what Let Me In: Crossroads is about, here's what Dark Horse told io9:
"Being forced to spend eternity as a vampire-trapped in the mind and body of a child, with slaughter the only recourse for survival-is torture enough. But when Abby finds herself faced with a ruthless real-estate tycoon willing to do anything to get at the property she and her caretaker call home, far more monstrous torments await. In a small community torn apart by vicious men who are consumed by greed, wrath, and envy, she will learn which deadly sin is truly deadliest.
Dark Horse Comics and Exclusive's legendary Hammer Films team up to take you even deeper into a tragic world of sophisticated horror with Let Me In: Crossroads, a chilling prequel to the highly anticipated film Let Me In. Written by Marc Andreyko (Manhunter, Predators), with art by Patric Reynolds (Abe Sapien: The Haunted Boy, Serenity: Float Out) and covers by Sean Phillips (Sleeper, Criminal, Incognito).
This four-issue miniseries will have specially enhanced variant covers for each issue."
Head over to io9 to see larger versions of the first two variant covers.