I've just logged into my eBay account and looking at my selling page it is showing the following offer:
100 Free insertion and Free selective optional upgrades Fees
For private sellers, up to 100 eligible listings Learn More
Available at ebay.co.uk
From 25/12/14 00:00:00 GMT
To 06/01/15 23:59:59 GMT
I've told friends and family and they are seeing it too in their accounts.
Looks like a great deal for those who use eBay anyway, to at least save on the listing fees.
Check your account(s) to see if this applies to you also, as it may be available to everyone.