Deus Ex 3 has only been announced for the PC so far. However, new evidence suggests it will be released for consoles as well.

A production manager for Eidos Montreal lists the game as "Deus Ex 3 - Xbox 360, Playstation 3, PC" on his LinkedIn profile. The same platforms are also mentioned in a senior software engineer's profile. The LinkedIn page of a production coordinator who started working at Eidos last month says the same, which seems to rule out the possibility that console iterations were cancelled along the way.

Eidos Montreal boss Stephane D'Astous stated in a recent interview that they wanted to make DX3 and "very attractive and accessible to a wider audience." That would seem to suggest these games are multiplatform. Still, they're being coy for now.