I think that when people refer to it as "like Game of Thrones" they mostly just mean there's a scene in the trailer where blood gets splashed on a young boy, and also maybe some elements of the tone that suggest dark/gritty. Maybe also some of the fashion choices, but I think part of that is that Game of Thrones is a recent high production values fantasy series, and most fantasy costuming is as much about current fashion as it is about the historical periods it's drawing inspiration from.
Obviously we don't know enough about plotting/themes etc to make any conclusions about whether it will have any significant resemblances to either the TV show Game of Thrones or the source material the show was based on.
Obviously we don't know enough about plotting/themes etc to make any conclusions about whether it will have any significant resemblances to either the TV show Game of Thrones or the source material the show was based on.