The antonyms for the phrase "more soon to be" depend on the context in which it is used. If it refers to upcoming events or plans, the antonyms could be "far-fetched," "unlikely," or "doubtful." On the other hand, if it relates to a current situation that is rapidly developing, the antonyms could be "slowing down," "stagnating," or "halting." If it denotes an abundance of something, the antonyms could be "scarce," "limited," or "insufficient." Similarly, if it indicates an immediate release or availability, the antonyms could be "delayed," "postponed," or "canceled." Understanding the context and intended meaning of "more soon to be" can help identify its appropriate antonym.