Generate an image of a large, intriguing 'coming soon' sign, enveloped in a sens

Generate an image of a large, intriguing 'coming soon' sign, enveloped in a sense of mystery. The sign stands tall against a backdrop of thick, creeping fog, emphasizing its looming presence. Periodic absence of light and shadow suggest that the environment is filled with suspense and secrecy. Despite the arcane atmosphere, the sign remains clear and welcoming, intriguing passersby with its promise of upcoming surprises.