We’ve just loaded up our copy of Killzone: Mercenary to find that there’s already a 1190MB patch, boasting “stability fixes and performance optimisations”, possibly balancing the multiplayer after feedback from the recent beta test or fixing a few unknown issues.

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While we can’t say what this actually does without breaking embargo, over a gigabyte seems pretty hefty for a day one patch, meaning the total size of the game will now be over 4.5GB rather than 3.3GB.

So, unless you’ve got a really big memory card, you’ll want to buy this game at retail. Our review will be live at 8AM tomorrow, so keep an eye out for that too.