As of my last update in January 2022, I don't have specific information about the iPhone 15, as it likely hasn't been released yet. However, I can speculate based on typical trends and advancements in smartphone technology.

Given Apple's track record, the iPhone 15 would likely feature improvements in camera capabilities, processing power, display technology, and possibly battery life. Here are some speculative features and specs:

Design: Apple often introduces design changes with new iPhone models, so the iPhone 15 might have a refreshed design, possibly with thinner bezels and a sleeker form factor.
Display: Expect enhancements to the display, such as increased refresh rate for smoother scrolling and better color accuracy. Apple may also introduce new display technologies like mini-LED or even OLED advancements.
Camera: Apple usually upgrades the camera system with each new iPhone iteration. The iPhone 15 could feature improvements in low-light performance, computational photography, and possibly increased optical zoom capabilities.
Processor: The iPhone 15 would likely come equipped with a new, more powerful processor, possibly named A16 or whatever Apple decides to call it. This chip would offer better performance and efficiency compared to its predecessors.
Battery: Apple tends to focus on optimizing battery life with each new iPhone release. The iPhone 15 might offer improved battery efficiency, potentially through advancements in chip technology and software optimization.
Connectivity: It's possible that the iPhone 15 could support the next generation of wireless connectivity, such as 5G advancements or Wi-Fi 6E.
Software: The iPhone 15 would likely launch with the latest version of iOS, offering new features and improvements in security, privacy, and user experience.
Keep in mind that these are speculative based on typical trends in the smartphone industry and Apple's past releases. For accurate information, you'd need to refer to official announcements from Apple once the iPhone 15 is unveiled.