setExportCSS and Smargwt 4.1p

I've seen in latest build javadoc the setExportCss(String) method.
But it's not in the latest build.
The question is, will it be in the 4.x build or it's for 5.x version only?

http://www.smartclient.com/smartgwtee-latest/javadoc/com/smartgwt/client/data/DSRequest.html#setExportCSS(java.lang.String)