I received a flyer in the mail last night, announcing the grand opening of its San Mateo location this Friday. The earlier post mentioned the opening this Wed., so I may stop by this afternoon to see if it's open already.
According to the Nijiya flyer, the deadline for ordering Osechi-Ryori (Japanese New Year's food) is Dec. 27th and at limited quantity. So, if you are interested, I suggest you order it now. The deluxe 3-tier version is $120, if I remember correctly.