A psVita and ps3 box set is a must , cross play in my eyes should absolutely be a big focus , even if it does not do the numbers you expect, bundling the two together will really help to promote the message that there's a big connection, highlighting the software that actually does crossplay well, will truly do that though.
I really hope that retailers do some cracking deals , but at the end of the day a lot has got to do with clever marketing, last year the PS3 was chipping away at the 360, then suddenly when Christmas came, the 360 sold 3 million+ and the PS3 was back at square one again, Microsoft don't miss any opportunity, and Nintendo had very clear almost Apple quality ads with well chosen celebs.
If there are Harry Potter movies on at Christmas, then there definitely should be a number of wonderbook adverts on in-between. Sony's campaign last Christmas was very weak, it must of taken the ad team at least 2 minutes to think it up, didn't show the products in any clear way at all, almost cringe worthy, certainly not cool, flip back to the PS2 advertising , its night and day.
Talking about the Christmas period last year, I feel the store was too static, there should be new deals every day, and something happening in home every day too. Folks going round other families houses should be seeing the ps3 in the best light and want to go off and purchase one, i.e. I could see the Activision bond game on the store dirt cheap and folks having battles with their favourite Bond's, Jaws, bond girls etc, sports champions with the move controller is really excellent-it craps all over the WII.
Microsoft do a very good job of promoting games and making folks think that their exclusive to that format, Call of Duty declassified and the brilliant looking new Killzone game are
totally exclusive for the VITA, so they should definitely be in an ad.
Anyway good luck Fergal , go for it.