We have been spoiled with Sony's press conferences at Gamescom every year. Other developers come and go, but Sony have one every year and often they have major things to share.
2015 will be an exception though. Sony has now announced that they won't have a press conference at this year's event in Cologne, which does of course means fewer announcements on their behalf. Whether this means Microsoft will opt out as well remains to be seen.
Sony will, however, do what they call a "international media briefing" during Paris Games Week on October 27.
Thanks, Video Gamer.