There was an official announcement at the annual Shepherds Conference held at Grace Community Church in Sun Valley California this week of a new edition of the MacArthur Study Bible.
This edition will be based on the ESV text and joins the previous editions which came in the NKJV and NASB.
Crossway Publishing has set up a website exclusive to this edition at: www.esvmacarthurstudybible.com
There you will find a video by Dr. MacArthur regarding the new edition. It appears that this will hit the market sometime this summer.