The summer issue was mailed on May 16.  The Fall and Winter issues will be mailed about 3 months and 6 months respectively after that.
That assumes you joined for this year.  Under the current membership policy, memberships run Jan-Jan.  If you elected to join this year then you will receive all 4 issues.  In that case the spring and summer issues will be mailed to you.  If you elected for a membership next year, then you will receive all 4 issues for next year (and none for 2005).
This is currently a very busy time in the AAW office.  The 2005 Symposium is in 2 weeks.  The symposium prep is the primary focus of the office work at this point.  So your other 2 issues may be a bit tardy.