Google appears to be developing an upgraded version of "BardAdvanced" that requires a paid subscription, which users can access through Google One. This advanced version seems to be powered by Google's latest large language model, Gemini Ultra, which offers enhanced features compared to the current version of Bard, known as Gemini Pro. In addition to the upgraded Bard, new features have been discovered, such as the ability to create custom bots and use AI to expand and improve Bard's prompts.