According to my dealer loaders are not shipped with tractors. They are a dealer installed option. If the LA526 will fit an L2501 you can probably specify which loader at time of purchase depending on availability.
It was my understand, from watching videos , so take that with a grain of salt, LOL, that the L2501 and L4701 are continuing but not getting the upgrades the new L3302 and L3902 have. This screen shot is from the Kubota USA site. Shows the 3 variations of the L2501, L3302, L3902 and the L4701. Since the L3301 and L3901 are not listed I am assuming this is current? I hope they do continue with L2501 and L4701.