If you pre-order Resistance Retribution through Amazon US before January 12th,  you will receive a unique code which allows you to download and play an early access demo.

This is good news for all the Resistance fan out there who remember the game would support Resistance 2,  similar to what is between the Wii and Nintendo DS. Only here it’s different. Once you hook up your PSP to your PS3, you will be able to play an alternate story through the special ‘Infected Mode’.

Sad news for the people outside North America, you won’t be able to get as it’s restricted to regions  where the Amazon US ships to.

Thanks to sysu3peat for letting the community know.

Source