In the first phase, the new paid subscription plan will be available for $20/month for US-based customers, and subscribers will receive several benefits:

• General access to ChatGPT, even during peak times
• Faster response times
• Priority access to new features and improvements

OpenAI plans to expand access and support to additional countries and regions soon. It plans to refine and develop this offering based on your feedback and needs. They will also soon be launching the ChatGPT API waitlist and are actively exploring options for lower-cost plans, business plans, and data packs for more availability.

Update 13/02/2022: ChatGPT Plus is now available in countries all over the world.

Source: https://openai.com/blog/chatgpt-plus/