OK, I just asked for confirmation about this again on the PS board. For those of you that can see it here is the thread:

http://community.ebay.co.uk/topic/Powerseller-Board/New-Picture-Standards/1700137623?start=20&ts=137...

For those that can't see it, here is the response from a Pink:

Sellers in the books, movies, music and video game categories are exempt from this standard so you can continue to use catalogue images when selling in the CD & DVD Categories and Books categories.   

booksandpatterns, 

Same applies here, books will also be exempt, so you can continue to list with catalogue images in t...

Thanks, 
Alan 

So, as I suggested would be likely when the changes were announced, mega listers will still be able to use stock photos from the catalogue.

(Oh, and I'd just like to point out that it was easier to ask 'can I', rather than 'will the megalisters be able to' - so although Alan is telling me, I can still list like that, I won't be! :))