I use blender 2.76 official build for Linux, with 1.0.1 Animation Nodes addon, and I don not have object info node to get object velocity. According to this tutorial it does exists:
I originally called the node "Object Info" because I had no idea how large the whole addon will become. At some point I noticed that I will need multiple nodes that get data from objects and to avoid some confusion I decided to rename some nodes to give them more detailed and exact names.
This is why the "Object Info" node is called "Object Transforms Input" nowadays. Beside that there are Object Attribute/Matrix/... Input nodes.
The Velocity sockets have been removed because they did not fit in very well, they made the code more complicated and (most importantly) did not work in all cases.
If you still want to know the velocity of an object you can get it with a little workaround (this does exactly what the node internally did before):