Well... Now we know.
Xbox Japan put a translated version of the presentation online for Japanese gamers to watch (yes, as Famitsu points out, the console is getting a Japanese release). And on 2ch, the country's largest forum, people chimed in with opinions. Here is a sample of some, certainly not all, of the comments from various 2ch users:
"It seems like the day has come for me to leave the Xbox. It's total nonsense that there is no backwards compatibility. Ah, but if The Idolmaster 3 comes out, I guess I'll have to buy it..."
"Television. The NFL. These things seem the biggest, but in Japan, they're totally irrelevant. For Japan, it's totally over. It's at the point where it doesn't matter if this doesn't sell in Japan."
"I gathered that they didn't think about Japan at all."
"I'm looking forward to the new Kinect."
"The PS4 [reveal] had more of a technical rundown, so it was more interesting."
"Western internet forums are on fire. lol"
"It was like, you can play those [old games] on the 360."
"Well, the controller didn't get worse. But, whatever..."
"Even if the functionality is increased, what you end up with is an old PC. It's okay they are putting effort into TV and video services. I don't need that, though, because I'm enjoying my PC gamer life."
"Put together a presentation for gamers."
"I wonder how Americans are gaming at home. Whenever I'm playing a game, I never feel like I want to watch TV, so the ability to switch between the two makes no sense to me."
"They [Microsoft] are not looking at Sony or Nintendo, but are frantically coming up with countermeasures for Apple and Google."
"And here, I thought they were going put out something with amazingly high specs..."
"The only thing I thought was amazing was the multi-tasking."
"Kinect is certainly amazing... But, what's this feeling I have that I cannot really explain... Have I turned into some elderly, decrepit gamer?"
"They're totally not thinking of Japan...This is worse than the Xbox 360."
"That D-pad on the controller was good. I guess they won't put that out on the slim Xbox 360."
"I like the console's design. But I have no clue why it's so damn big."
"The reaction from foreigners isn't good. On Twitter, it's being trashed."