Just upgraded to QGIS 2.2 and it looks like saving a layer as CSV doesn't support GEOMETRY=AS_WKT anymore. The new Layer Options portion of the save dialog is cool but it looks like GEOMETRY and LINEFORMAT for CSV have some swapped options (CRLF and AS_WKT are in opposite option lists). I tried custom layer options:
GEOMETRY=AS_WKT SEPARATOR=SEMICOLON LINEFORMAT=CRLF
Those worked under QGIS 2.0 but don't appear to work with QGIS 2.2.