i've placed a number of different workstations 48 blocks away from the only villager within over 300 blocks of my current location. no matter what workstation i place, a newly placed villager after that will become that profession. from what i've heard, the limit was to search 8 blocks horizontally.
also, can you provide me with the exact specification, or a link to an official mojang webpage with all the information regarding the new villagers, since the snapshot pages do not include a lot of the information to determine if an actual bug exists. I want to know exactly how far horizontally, vertically and diagonally villagers are supposed to look for a workstation, how long a work station has to be abandoned before another villager can claim it, how long it takes before a villager can change professions, etc.