B2延期结果请教

请问老师：这个 b2 延期结果 approved post decision activity 是啥意思？ 和普通的approved 有啥不同？如下结果：

Post Decision Activity On May 3, 2012, we mailed you a notice that we have approved this I539 APPLICATION TO EXTEND OR CHANGE NONIMMIGRANT STATUS. Please follow any instructions on the notice.（还没收到信，请问都会有什么instructions？） If you move before you receive the notice, call customer service at 1-800-375-5283. For approved applications/petitions, post-decision activity may include USCIS sending notification of the approved application/petition to the National Visa Center or the Department of State. For denied applications/petitions, post-decision activity may include the processing of an appeal and/or motions to reopen or reconsider and revocations.

所有跟帖： 

• 回复：B2延期结果请教 -Bodd- ♀ (2430 bytes) () 05/07/2012 postreply 09:55:31

• 回复：回复：B2延期结果请教 -miarity- ♀ (27 bytes) () 05/09/2012 postreply 12:25:22

• 请问你B2延期何时开始申请的? -LazyBoy- ♀ (214 bytes) () 05/07/2012 postreply 15:04:49

• 回复：请问你B2延期何时开始申请的? -miarity- ♀ (372 bytes) () 05/09/2012 postreply 12:24:05