for those of you that are getting prototype within the next dew days you might find there is an install bug but there is also a workaround until it gets patched details below:
If your PS3 tells you that you don't have enough hard disk space for the installation -- and you know that it's LYING to you -- then you'll have to use this workaround, provided by Activision support: change the amount of free hard disk space on your system by 700MB. This can be done by either installing another PS3 game (like Infamous), downloading game demos (like the Infamous demo), or downloading and removing videos from the hard drive (like videos of Infamous).
The Activision support site notes the team is working on a better solution: "We take this issue very seriously and are working to resolve this issue as soon as possible. We apologize for any inconvenience this may cause." We're sure PS3 owners will patiently wait for a patch.
that's good to know i really want to play it but i am on like 3 diffrent games as it is hopefully it will be patched by the time i get round to it