News from day 1 of E3 and Steelseries have announced a collaboration with Valve, manufacturing peripherals for Counter-Strike: Global Offensive and Dota 2.
For CS:GO there is the SteelSeries Siberia v2 CS:GO Headset, the SteelSeries Kana CS:GO Mouse and QcK Mousepad.
For Dota 2 there is the SteelSeries Kana Dota 2 Edition Bundle, which includes the Steelseries Kana Dota 2 Edition and the SteelSeries QcK Mini Mousemat. The bundle also comes with an exclusive Dota 2 in-game item (A sword for Juggernaut).