BIN to not be sold until paid. No more need for IPR?

Beginning in May, eligible fixed price listings and auction-style listings purchased with Buy It Now will remain for sale until a buyer has paid for the item. This change will be rolled out slowly over the course of the year and will eliminate a significant number of unpaid items on eBay by the end of 2013. 

Near as I can tell, this is a solid win all the way around, because it allows seller to quote combined shipping while buyer is deciding.  Buyer can "buy", but the buy isn't for real until buyer pays.  And between buying and paying, buyer can request total.

There has always been a major tension between unpaid items and combined shipping.  If Ebay can resolve that tension, good for them.

IPR has worked fine for single sales, but leaves a combined shipping mess.

Please, please Ebay. Don't give buyer a strike for failing to pay for this kind of item.

Lastly, we find this quote:
If you do not use the combined shipping discounts feature, buyers must also click the Request Total button in the Shopping Cart to request a new invoice reflecting their shipping discount.

This means one of two things.
1. The shopping cart will be modified to include a "Request Total" link.
2. What they're talking about is the current Request Total after buying but before paying.

Either will be fine, so long as buyer has the option of declining to proceed after learning the combined shipping.