The Thor v2 looks just about the same on the inside. Not a whole lot has changed besides the new USB 3.0 pass-through cable replacing the old single USB 2.0 connector.
The 5.25″ Retention System is the exact same as before. Nothing’s changed here, and I’m happy to see this, as it allows you to use tooless, or screws. Which is very useful and helpful.
In a more standard fashion, the Thor v2 uses thumbscrews; unlike the Thor v1 which used a tooless retention system. Users did complain about it being harder to use, and more complicated; so Rosewill’s v2 model went with a simpler solution that’s semi-tooless.