Ok, I'm now very confused. When I saw the title I thought "Pivotal Labs" for a second and then "oh no, the 'other' Pivotal that is not Pivotal Labs and which I have no idea what they're doing". I got confused and the past and realized (or thought at least) they were two different entities.
But now, you, as well as an investor quoted in the OP[0], say "Pivotal Labs". Are these two the same thing? Are these two different but related entities? A cursory look at each sites don't seem to mark them linked, though it does show that the OP is about Pivotal as in http://www.gopivotal.com/
Thanks for the clarification!
[0] Actually he's quoted like so: "Palihapitiya even noted that Xtreme had built a “Pivotal Labs for mobile.”", which in itself doesn't mean the buyer is Pivotal Labs, but, in the context, is confusing. It almost sounds like the post's author get the two confused as well. (unless, they're the same thing obviously)