GamesRadar reports that Epic has posted a job listing related to "an unannounced competitive online action game." Senior Systems Designer is the official position title, and it apparently requires someone with "a passion for building and/or playing shooters, MMOs, RPGs, or RTS games." Epic is advertising for one of two projects. The first is a tower defense title called Fortnite, while the other is an unnamed game that "includes player progression, heavy itemization, and a dynamic economy."
GamesRadar notes that its Gears of War speculation is just that, but we have to admit that it sounds both plausible and interesting.