"Google will retain the vast majority of Motorola’s patents, which we will continue to use to defend the entire Android ecosystem. "
[1] http://googleblog.blogspot.com/2014/01/lenovo-to-acquire-mot...
Relevant: https://twitter.com/reckless/status/428653694998298624
Also, I've followed Nilay's post on several of these patent issues; he's either wrong or he sensationalizes to fit his narrative. I don't think he's very credible, even with a J.D.
Unless you want to make the leap that they've been holding back all their valuable IP from their patent assertions for some unknown reason, I think it's a pretty safe conclusion.
I just don't see the scenario were you can't do a licensing deal with your opponent but you agree to use you second rank patents in the lawsuit.
Standards-essential patents that have to be licensed on FRAND terms are "worthless" only in the sense that an ongoing income stream is worthless.
The purpose of patents in the smartphone wars is to force your competitors to deliver second rate phones or collect billions in damages. That's what Microsoft and Apple are doing to Android manufacturers. If Google can't retaliate, the patents are worthless in this context.
FRAND patents will never block Microsoft and Apple from using common, obvious functionality on their phones. Therefore they're worthless.
Microsoft have ignored standards and instead patented obvious necessary functionality and user interface elements and mathematical operations. Since prior art and obviousness are a dead letter at the Patent Office and the courts, these are the patents that are useful and valuable.
Essential technology patents based on research and development are worthless. Bounce-to-refresh, search boxes that actually search, long filenames, and other trivial or long known elements that can be forced past exhausted patent examiners are worth everything.