Really? Because I see Sony this gen focusing hard on the US of A. Sorry Japan... Sorry Europe. But Sony is gunning for the USA first and foremost. Do the other countries matter? Of course. But is USA the most important to be "hot" in? I'd say yes.
They're "focusing" on America because they've essentially locked down every other market already. There's not much point in putting a focus on Japan when they already know the X-Box One is going to be a monumental flop there. There's not much point in putting a focus on Eastern Europe when they already have a massive head-start there due to Microsoft retracting from their plans to release early in those markets.
America and the UK are the only markets it was ever remotely possible for them
not to have a major sales lead in, and they've chosen to go for a complete coup d'etat - aiming to uproot Microsoft from the only strongholds of support they have left - rather than just being "satisfied" with holding dominion over essentially the entire rest of the world.
Microsoft was planning to do the same thing, back when they thought they were coming into this sales cycle at an advantage. The weird news you see out of Microsoft Japan - their attempts to court Japanese developers and make a sales push in the country - are leftovers from a worldwide strategy planned out when they
thought they were going to be the clear front-runner in most markets. They were confident enough in taking America and Europe that they felt they could afford to expend resources on another wasted effort trying to gain a foothold in Japan.
The companies both wanted to hit the competition where they live, though they probably viewed the effort to do so as a somewhat distant hope. The difference is that Microsoft's blunders have made their plans to expand into Japan completely, absurdly laughable, and simultaneously made Sony's plans to take the market lead in America and the UK suddenly - and frighteningly, for Microsoft - within the realm of possibility. As a result, Microsoft has begun a retraction from their efforts to expand further in the worldwide market in hopes of consolidating a market they previously believed they had on lock, albeit with a few vestigial pieces of their global expansion plan - like the Japanese deals - flailing out there embarrassingly due to being too far along to abort by the time the rug got pulled out from under them.
The fact Microsoft and Sony are focused on the US is
not an indicator of how important the US is to the global market, but rather a stark indicator of just how desperate Microsoft's situation has become. They're basically scrambling just to hold onto the market share they had going into this generation, and have almost completely abandoned dreams of expanding their markets.