We already know that with PS4 :
-Sony's main focus is core gaming, even if they also will have movies/tv/music/etc stuff.
-Sony won't block second hand, even if it seems that will include online pass for games.
-Sony won't require internet connection to play.
-Have support from the main game engines and big 3rd parties so seems that it's going to skip the PS3 issue of early exclusives for 360 or weak early 3rd party support.
-Has some 1st party exclusives announced + even if not confirmed several others to be announced for the 1st year.
-Has more powerful hardware than X1.
-Will reduce loading, downloading, patching, FW updating times doing all the stuff in background.
-Supports indies and allow them self publish.
-Has hardware and tools eally easy to program for, so will skip the related PS3 issue.
-Launch is scheduled for this year, so won't release too late when compared to MS skipping the PS3 issue.
-Healthy PS3 providing profits and well positioned this and next year thanks to current great game line up coming, PS+ and possible future price cuts.
-Vita for perfect remote play or second screen stuff thanks to physical buttons, analogs, touchscreen, bluetooth+wifin etc.
-The 3D camera has less resolution but more framerate than the X1 one, so may end being more responsive, with less lag.
So the only bad PS4 news can be :
-Too expensive launch price for the mainstream ($500+).
-Online multiplayer behind a paywall.
-Online pass for games too expensive.
-Too small HDD + only expensive propietary additional storage allowed (see Xbox 360).
-Too much focus on casual gaming related to the camera, social stuff, etc.
-No megatons for PS4 announced in E3 (Uncharted 4, Last Guardian, Versus XIII/FF XV, GT6, etc).
-No new big exclusive IPs announced in E3 from SSM, ND, MM, QD, GG, RaD or similar (includes 3rd party).
In any case even if some of these bad news are announced, they would be way less important than the issues shown in the launch of PS3, WiiU or (likely) X1.
Outside from PS4, I think a bad new can be Vita not getting enough support with a lot of announced games, great PS4 connectivity (Remote Play / second screen stuff) performance and maybe a pricecut, at least for storage.