Most recently, Son has been in talks with both T-Mobile and the feds (both the FCC and the DoJ), trying to make a Sprint - T-Mobile deal happen. Consolidating the two would make them a match for Verizon and AT&T, the two behemoths of the US wireless market. Son has made the case that despite T-Mobile's relative success over the past couple of years, the market is effectively a duopoly right now, and the 3rd and 4th largest carriers are too comparatively small to effectively compete. Democratic officials in the government (especially FCC Chairman Tom Wheeler) have been signalling that they disagree, and that 4 is their preferred number of major competitors. Now, it seems, Sprint has lined up financing for the deal and is considering whether to move full speed ahead and damn the torpedos (!) or wait for more favorable circumstances, such as a new administration. While Republicans are generally more friendly to M&A, there's no guarantee that they will retake the White House in two years, and I'm not sure if Son will want to wait that long, potentially for little gain.
Meanwhile, it looks like Softbank has been making small moves to raise its own stock in the US, detatched from Sprint. For what purpose, I'm not sure. Lately I have seen these ads in the metro:
It looks like it's trying to make a pitch for itself and get its name out there, but..."Expect the unexpected," indeed. As someone who has lived in Japan, I am familiar with Softbank, but even I don't know what to expect from them here in the US. Though I must admit that I checked out the website and looked for a "careers" section. There was not one.