This should actually become a staple perk of Gamer`s Club Unlocked(GCU) going forward where gamers can trade their current gen version of a title into a nex gen counterpart. GTA V has been an epic selling title with over 33 million copies sold so being able to secure a larger % of the next gen sales will also be huge for BB. You`ve already done well by offering $10 credit for pre-ordering the next gen version but in order to secure the customers who already have the current gen you`re gonna need more otherwise they`ll just wait for a sale price. Piggybacking a trade in promo directly designed to get the current gen trade in & next gen $10 pre-order will be the best deal going meaning BB will see a huge influx of trades, $10 pre-orders & even GCU subs. Work the marketing out to get GCU in the actual marketing materials which combined with GTA V hype will propel interest in the program. A commercial campain along the lines of what Walmart currently does should do wonders.