The official Fortnite Twitter account appeared to unveil the battle pass lineup for its upcoming retro-gaming-themed season on Monday morning. But, even though the season trailer teased several new collab skins from other video games–like Crash Bandicoot and Mega Man–it looks the Chapter 7 Season 4 battle pass will have Sonic the Hedgehog as its only collab skin when the new season kicks off on Thursday. It is possible, and maybe even likely, that Epic Games is holding something. The…