Speaking to Gamereactor in a video interview at E3 earlier this month, Sony Computer Entertainment Europe CEO Jim Ryan said:

"We very consciously at the [PS4 reveal] event in New York on February 20 showed a lot of software, a lot of first party software. What we did at E3 was really show some updates to those games and introduce The Order 1886.

"There's a lot [of games] coming. I'm sure you heard from Shuhei [Yoshida, president of Sony Worldwide Studios] that he has, just from his studios, 30 games in development. 20 are going to ship within the first year of the console's life and of those 12 are new IPs, so there's a lot going on, it's just that we need to keep stuff back. We've got Gamescom for us Europeans and we need something to show at Gamescom."

This year's Gamescom runs from August 21-25 in Cologne, Germany. Microsoft and Nintendo will attend Gamescom 2013 after both skipped last year's show. Other confirmed attendees include Bethesda, Deep Silver, EA, Konami, Ubisoft and Warner Bros.