Konami just announced that players who pre-order Metal Gear Solid 5: Ground Zeroes for PS3 will get the MGS theme for free.
You can take a look at the official Konami tweet below:
— Konami (@Konami) March 12, 2014
You can also take a look at the screenshots that Famitsu posted in their latest issue here.
Metal Gear Solid 5: Ground Zeroes is scheduled to release on March 18 in the States, then March 23 across Europe for PS4, PS3, Xbox One and Xbox 360.
Source: Sony Entertainment Network