What does "a circular to this effect" mean here?

Biuis   Thu May 10, 2007 3:52 am GMT
I understand that a circular to this effect will be issued in the next few weeks.
What does "a circular to this effect" mean here?
Guest   Thu May 10, 2007 4:11 am GMT
circular - a letter, advertisement, notice, or statement for circulation among the general public

"to this effect" is referring to the subject at hand.