The iPad 2 is actually a fair amount more powerful than people give credit for. Compared to an XBOX 360, it has worse CPU, better GPU, similar RAM. The iPad 2 also has much faster data retrieval which could be key to helping his game perform.
Reference:
http://en.wikipedia.org/wiki/Xbox_360_hardware
http://osxdaily.com/2011/03/02/ipad-2-specs/
It's not too far fetched to assume that the game is being developed for the iPad 3 and beyond. The iPad 3 system specs have a very good chance of dwarfing the XBOX 360's system specs.
As for why it needs such high system specs? It's because the game really desires/requires the player to see to the edge of the horizon of the game world. Most games hide that behind a fog so that the hardware requirements stay lower but as I understand, it's not really an option for this game.
Reference:
http://en.wikipedia.org/wiki/Xbox_360_hardware
http://osxdaily.com/2011/03/02/ipad-2-specs/
It's not too far fetched to assume that the game is being developed for the iPad 3 and beyond. The iPad 3 system specs have a very good chance of dwarfing the XBOX 360's system specs.
As for why it needs such high system specs? It's because the game really desires/requires the player to see to the edge of the horizon of the game world. Most games hide that behind a fog so that the hardware requirements stay lower but as I understand, it's not really an option for this game.