I think it will be pretty much like this gen.
Nintendo with the least powerful (though thankfully at least with some decent power behind it this time). Focus will be the Tablet controller and a better online experience.
MS with a machine that's developer friendly and quite powerful. Focus will be on the dashboard with all it's apps, XBL, advertising revenue and Kinect v2.
Sony will force some exotic propriety technology onto the machine for the benefit of the conglomerate as a whole rather than just the gaming division. Only a few in-house developers with a large budget and time on their hands can fully exploit this new fangled tech that no one has heard of just yet. Most powerful out of the 3 but a pain in the ass to develop for initially. Sony will stick to their guns but hope they can strategise better this time around so as not to lose so much market share and not release so much later.
