The Exciting Era of AI Human Avatars: Unlocking New Possibilities

The Current State of Art for AI Avatars

1. Replicate human-like movements and expressions: It is now possible for AI avatars to depict in detail the subtlety of human body language, facial expressions, and gestures. These make the avatars more relatable and much more interesting and engaging to users.
2. Engage in natural-sounding conversations: The AI-powered dialogue systems have dramatically improved, enabling an avatar to engage in coherent and context-dependent discussions.
3. Learn and adapt based on user interaction: Machine learning algorithms can make the avatars learn from the input received through user interactions. Avatars will, over time, refine their responses and behaviors.

1. Deep learning techniques: Increasingly deep neural networks have substantially improved the accuracy and subtlety of interactions made by AI avatars.
2. Motion capture technology: The employment of motion capture systems has allowed the creation of more realistic and smooth avatar movements.
3. Development of computer graphics: More powerful rendering has made the development of highly detailed and lifelike avatar models possible.

Implications for Business

1. Entertainment: AI human avatars can enhance the gaming and animation industries by offering a more immersive and interactive experience.
2. Education: They can make education more interactive by creating personalized learning. Plus avatars can engage younger students more effectively.
3. Customer Service: AI human avatars will be able to provide customer support 24/7 with no downtime. This will reduce costs while increasing customer satisfaction.

Ethical Considerations

1. Blurring the lines between human and artificial interactions:  The possibility of users developing an emotional attachment to an AI avatar is a real concern. This is of particular concern for those more comfortable communicating digitally.
2. Deception and manipulation: More important (and unfortunately a growing issue) is the use of AI avatars in the deception or manipulation of people to achieve a certain end, as in phishing scams or propaganda.
3. Bias and representation: AI-made avatars are bound to reproduce existing biases and stereotypes, highlighting the need for diversity and representation.

Possible Future Developments and Issues

1. Apply to more industries: The use of Artificial Intelligence & Avatars will increase rapidly in such sectors as health and finances, changing both how we engage with the technology and with the service provider. 
2. Emotional intelligence: AI avatars will increasingly know how to read and respond to human emotions, further clouding the line between human-artificial interaction.
3. Regulatory frameworks: Governments and other organizations will likely have to formulate mechanisms and policies that ensure the responsible development and deployment of AI avatars.

1. Job displacement: With the increased use of AI avatars some jobs are liable to be replaced or even phased out. This means that retraining and upskilling of employees will increasingly become an imperative.
2. Dependence on technology: Over-reliance on AI avatars might cause diminished human interaction and social skills, an issue that is already of great concern, particularly among younger generations.
3. Cybersecurity risks: The more these human mimics are used, the more vulnerable organizations will be requiring greater levels of security, monitoring, and vigilance. 

Conclusion:

The rapid development of AI human avatars will have huge implications for various sectors and society in general. We are already seeing the seemingly constant increase in the pace of  AI technology development, therefore, it behoves us to start looking into the ethical considerations and potential societal impacts of such developments now. In doing this, we can ensure that the benefits of AI human avatars are harnessed while the risks and challenges accompanying them are minimal.