I'm fairly sure they will keep them seperate. I think one of the articles I read said the boys will be kept seperate. But even so introducing adult males would likely lead to fighting for dominance. Polar bears are fairly solitary creatures. Now in zoos they do cohabitate but its usually a mating pair or sibling set with perhaps an additional mate. The chance of mixing an older bear like Arturo with two young bears is probably not wise even though hes been socialized. The new bear is an adult who could have been raised with siblings but hes still young so he might be more inclined to take to others. Hudson has never been with other bears since his mother killed his siblings. He might not know how handle being with bears who are bigger and older (hes just about to turn 2 and would just now be cast out by mom). If any were to be pair Hudson and new bear might be a pair because they are both fairly young. My bet though stays on them remaining seperate until females arrive. Arturo if he comes and is a former Canadian bear and the new bear will be priority breeders so they might not stay long because they have no connections to any bears in Canadian zoos. Hudson on the other hand despite being born from wild bears is related to his parents, aunt, and half brother and half sister, which will only increase as his relatives breed.