Michael,

 The new SM4 wedges will have more durable grooves, as they are heat treated.  There will also be re-engineered grooves with tighter scoreline spacing that are at the limits of the Rules of Golf.  There will also be an improved appearance by making the head shape a slightly larger teardrop profile.  We will be offering more bounce options in different lofts, as well as incorporating tour grinds to the soles of the SM4. 

To learn more, click on the link http://www.vokey.com/wedges/detail.aspx?id=105

Cameron

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