It says it's pre-seasoned so maybe I don't have to. Also, it says oven safe up to 400 now that I look at it. Only 400?
It's still a good idea to season it yourself! I highly recommend it and it will help prevent sticking. Also washing it thoroughly will help remove any residue from the factory.
Also make sure to always put it away dry - any moisture could lead to rusting. This just means heating up the pan after you've cleaned it on the stove for 5 minutes until the water has evaporated.
400 might be the "safe" temperature, but I've put mine in the oven at 500 before. I'd experiment to see how high it can go.