The eight-week series will award a total of $8m (£6.05m) in prize money beginning with a $250,000 (£190,000) competition this weekend focused only on duos. Participants will be content creators and prominent competitive players but the announcement also states the format for future Summer Skirmish competitions will change week-to-week. No other announcements were made as to the specifics of the format i.e. all duos in a custom server, rankings based on kills, placements in a match or both.
Source: N4G PC Epic announced m Fortnite summer series – Esports Insider