I just quickly checked Kubota.com and it confirmed that the M5700 will accept a LA1002 FEL and a M4711 backhoe. I would imagine that other complanies also make loaders and backhoes for this tractor.
When I first started looking at tractors I test drove one of these M5700. It has a really smooth 5 cylinder engine. I was impressed with it but I was wanted just a little more hp for my applications.
Ford 9n/ IH Cub/ Case VAH/Husquavarna riding mower
Garrabo, Kubota makes a loader for the M5700 and M5700cab
They also make a backhoe for the M5700 but I don't think it will fit on the cab model because the seat would hit the back window.
They have loader and backhoes combinations for larger setups including the 6800 and larger. Kubota mounts it's backhoes tight to the rearend for more strength which hinders seat room for the hoe.