If you pre-order Deus Ex: Human Revolution on Steam, you'll receive eight new, Deus Ex-themed items in Team Fortress 2.
These items are available separately from Team Fortress 2's in-game Mann Co. Store, and through item drops and crafting.
Half of the Deus Ex items are cosmetic: Deus Specs (glasses), The Company Man (baseball cap), The Nanobalaclava (helmet - Spy only) and The Purity Fist (robotic arm - Heavy only).
The other four items affect gameplay. The Machina sniper rifle is for the Sniper class and, at full charge, adds 15 per cent damage and player-penetrating bullets. But The Machina uses exposing tracer rounds and will only go bang when zoomed.
The Diamondback hand gun (looks like a Magnum) is for the Spy. This grants a critical shot for each building destroyed with your sapper attached. But in general use, The Diamondback has a minus 15 per cent damage penalty and no chance for random critical hits.
The Widowmaker and The Short Circuit are for the Engineer. The Widowmaker (is it a shotgun?) adds 100 per cent of damage to ammo and requires no reload. But the ammo cost is expensive: -60 metal each shot.
The Short Circuit attaches to your hand and fires an electric field that damages projectiles and players. But there's chance for random critical hits and you'll lose 35 metal each shot.
Team Fortress 2 has turned free-to-play, which means you've little excuse not to at least try it. Then consider Eurogamer's recent 10/10 Team Fortress 2 re-review, and you have even fewer excuses not to dive in. Most old PCs can handle it.