Nissan had been putting out about 60 a week at year's end on average. They are looking to have about 6K produced in the next 8 weeks for the domestic market, and another 500ish for the US by end of March just to keep a few showing up. So with 500 more or less done (or almost done) now, to make those commitments you are looking at the factory running at about half capacity this quarter. 500/wk-ish
They are probably still not comfortable(or can't) churning at full speed in the near future given their slower than expected ramp-up so I'd say 500/wk is about the peak for now--that and there maybe some kind of holdup in the supply chain that doesn't let them run full out. (although that is a total WAG/speculation on my part)
I think will see the 'US production taps' turned on in Oppama in April, because they are pretty much forced to churn out all demand in Japan in the next 3 months, which means nothing of real substance here until June-ish. /sucks but what can you do?