xiaobaitu 等高手请教，I-485转到local office.

我先生的i-485在几天前刚刚通过。今天我受到uscis的e-mail，说我的case转到了local office：

on july 21, 2006, we transferred your i485 application to register permanent residence or to adjust status to an office in xxx for processing. our office in xxx will send you a written decision as soon as processing is complete. you should receive a notice ining you that your case has been transferred to a local office.

到底是为什么呐，还需要什么process？需要所谓的面试吗，
谢谢回答。