The construction of 6G network facilities has already begun for major Chinese telecom companies. Beijing Mobile China Mobile is the first operator to have started researching 6G technology; it has set up a separate exhibition area at this year's Mobile World Congress showcasing its progress in 6G along with several forums debating pertinent topics here. China Telecom and China Unicom were among the major players at the ongoing Mobile World Congress in Shanghai. The event opened with more than 300 Global Mobile manufacturers, operators, and vendors.

As of my knowledge cutoff in September 2021, the deployment of 6G networks and the showcasing of 6G capabilities by Chinese mobile operators such as China Mobile, China Telecom, and China Unicom are still in the early stages. However, I can provide a general description of the anticipated capabilities and potential focus areas of 6G networks based on industry trends and expectations. Please note that this information may not reflect the latest developments as of today.

1. Ultra-High-Speed and Low Latency: 6G is expected to deliver significantly faster speeds and lower latency compared to previous generations. It aims to achieve data transfer rates in the terabits per second range and latency as low as a few milliseconds, enabling near-instantaneous communication and immersive applications.

2. Massive Connection Density: 6G networks aim to support an incredibly high number of connected devices per unit area. This capability is crucial for enabling the widespread implementation of Internet of Things (IoT) devices, smart cities, and other applications that require the simultaneous connectivity of a massive number of devices.

3. Extended Spectrum and Frequency Bands: 6G is expected to leverage new, higher frequency ranges beyond the capabilities of 5G networks. These frequency bands, such as the terahertz (THz) band, offer broader bandwidths and enable faster data transmission, but they come with challenges related to signal propagation and coverage.

4. Intelligent and Immersive Experience: 6G is anticipated to enhance user experiences with advanced technologies like augmented reality (AR), virtual reality (VR), holography, and advanced human-computer interaction. This could involve innovations such as ultra-high-definition content streaming, real-time holographic communications, and immersive virtual experiences.

5. AI-Enabled Networks: AI and machine learning are expected to play a significant role in 6G networks, allowing for intelligent network management, resource allocation, and optimization. AI-based technologies can enhance network efficiency, security, and quality of service while enabling new and innovative applications.

6. Green and Sustainable Networks: Energy efficiency and sustainability are likely to be key considerations in 6G networks. Efforts will be made to minimize the environmental impact through advancements in energy-efficient hardware and network optimization techniques.

It's important to note that the actual implementation and deployment of 6G networks and the showcase of their capabilities by Chinese mobile operators may vary in terms of their specific focus areas and strategies. To stay informed about the latest developments in 6G technology and the specific advancements by China Mobile, China Telecom, and China Unicom, it is recommended to follow official announcements, industry news, and the respective operators' updates.