Basically, tons of reviewers/journalists are on Facebook/Twitter making hints at something very damaging. Microsoft isn't allowing any reviewers to make PS4 vs. Xbox One comparisons, nor are they handing out Xbone versions of games for reviews. Xbox One reviews are embargo'd until Noon on launch day.
From what I've read on Twitter, NeoGAF and other sources, basically, the console's ESRAM is this generation's Cell CPU. It makes games harder to develop for, which is resulting in a lot of multiplatform games being in lower resolutions, slower frame rates, and lower textures.