Tom Goldstein at SCOTUSBlog offers some detailed thoughts about Jones v. United States, along with some SCOTUS kremlinology and the following prediction:
[A]lthough the government lost Jones 9-0, it did far better than everyone has recognized so far. I believe that it is more likely than not to prevail in a later case in which it installs a GPS monitor without a warrant and tracks the individual for only a couple of days.