This site seems to think it is going to be on the Wii:
http://www.n-europe.com/news.php?nid=11143
Free Radical have announced that TimeSplitters 4 will be making it's way onto the Wii...
Today, Free Fadical design announced that TimeSplitters 4 will be on the Wii.
The TimeSplitters games are hugely popular first person shooter titles filled with tonnes of humour (and it's British humour, too). Free Radical haven't announced much information on TimeSplitters 4, but parodies of other games will be a large part of the game. The current logo is homage to God of War and Free Radical have shown concept art of a monkey in Master Chief's (from Halo) armour.
We will bring you more information on the game as it is revealed.







