What was added:

Two new tags!

<want_sale> Y </want_sale>

AND

<want_sale_exp> Y </want_sale_exp>

If set to "Y", then the itemquery tag will return  <want_sale> Y </want_sale> ; will return "N" if not on sale.
<sale_expires_on>07/10/2006 </sale_expires_on>  will return the date that the sale expires.

NOTE:
In Quick Lookup, the on sale flag displays an "*" if that part is currently on sale.