I can see no direct implication on humanity a Humanzee will bring, but it will rock the scientific and religious world, without a doubt. The creation of a parahuman such as the Humanzee would be a sure sign that human-animal hybrids are surely possible. Then it's up to an individual's personal sentiments whether he percieves this as a good or bad thing. For one, people concerned with research ethics will be horrified due to the possibility of experiments on humans to be carried out on a larger scale in the future. Religious leaders will be horrified, because generally a human-animal hybrid would be unthinkable, sacrilegeous even, to any religion, because religion believes in the purity of the human soul, and to have a sub-human hybrid would be chaos. It parallels the situation between African Americans and White Americans in the early 1900s, where whites considered blacks to be inferior, but those of mixed ethnicity to be even worse.
Also, depending on the degree of human sentience this parahuman shows, concerns might arise about the possibility of a new sub-species of hybridized humans living alongside humanity itself. There is no doubt that if the cross-breeding of humans and animals is continued, discrimination will arise against these supposedly "inferior" beings.
Other than that, the possibilies are endless. Researchers could use these parahumans, basically animals with the power of speech, to find out more on how animals think. What do they think of us killing them for food? What do they think about the human species as a whole?
However, I personally believe that the case scientists delving more into parahuman research is unlikely, due to the fact that another branch of human evolution, generally regarded as far superior to humanity, has been recently getting increased attention. That is, human-machine hybrids, ala Cyborgs. It is unlikely that scientists will choose to pursue both paths of human experimentation, and they will probably stick to cyborgs.
But I digress. I'm keen to read the opinions of other members here on this highly intriguing topic.