From the February 3rd, 2014, PC Legendary Members will noticed important change, instead of receiving 500 Station Cash monthly, they will receive in-game currency called Loyalty Points. Each month they will be granted $5 USD worth of Loyalty Points, which can be spent on Marketplace items at a special Loyalty Vendor. DLC packs will not be purchasable with Loyalty Points.
This will not impact PlayStation 3 players, since they will continue to use the Loyalty system. This affects anyone who is currently receiving Station Cash every month, and with this change they will move to a Loyalty Point system.
Your Station Cash balance will be completely unaffected and there will still be plenty of Station Cash items available for purchase. This change affects the current benefit of receiving 500 Station Cash monthly, and will be replaced with a similar program that grants Loyalty Points.
Source: DCUO Forums