The link provides very little information.
"You choose how much you’re willing to pay to promote your items—from 1% to 20% of the item’s sale price."
So with this new program you do not pay to advertise, you only pay extra when you sell. So if your FVF on the item you sell is 9% and you wish to spend 5% extra to promote your items, you effectively end up paying 14% when you sell.
There is not much to add at this time until eBay tells us a bit more about the new program. In the meantime, I have added my name to the "waiting list".
eBay has experimented with three different programs over the last fifteen years where sellers would pay to advertise their store or specific listings on the site.
For my money, the last one "AdCommerce" was the best. Sellers were bidding against each other to get an advertising spot in different sub-categories. From memory, the program cost me slightly more than US$50 a month on average to generate an additional US$1,000+ in sales. It was quite easy to track sales that were generated by the advertising program - by product and by country! It was money well spent. With AdCommerce, you did not pay for each impression of your ad, you paid when a potential buyer clicked on it. It was a pay-per-click plan. You could have 1,000,000 impressions of your ad and only pay for the100 buyers who clicked on it.
For relatively new sellers, here is some background information on AdCommerce:
http://announcements.ebay.com/2008/09/coming-soon-ebay-adcommerce-a-text-advertising-solution-for-se...
http://www.ebay.com/gds/AdCommerce-Review-/10000000009636817/g.html
http://tamebay.com/2010/07/ebay-terminate-adcommerce-for-ebay-com.html