The Dokker supports graphics cards up to 32cm (~12.6in) long, which is enough clearance for the beastly Radeon HD 5970 (30.9cm), so mainstream cards should fit comfortably. It ships with one 120mm rear exhaust fan and a few dust filters, but you can install up to six more fans and there's support for liquid cooling setups if that's what you're into.
Speaking of cooling, Thermaltake made sure to note that the front panel has a mesh design and the expansion slots have vents to promote better airflow. As is becoming standard among chassis, the Dokker's motherboard tray has a large hole so it's easier to access the backside of your CPU. There's also a hole in the tray for cable management.
Other features include a keyboard and mouse security lock, anti-vibration HDD mounts, three 5.25-inch and one 3.5-inch external bays, five 3.5-inch internal bays, seven expansion slots, and two USB 2.0 ports along with an audio jack (no USB 3.0). The Dokker seems to be available immediately but is currently listed as out of stock via Thermaltake.