Refers to the likely future success or favorable development of something, often used in business or personal contexts.
This new product has good prospects.
His future doesn't seem promising.
将来性 emphasizes future potential or promise, similar to 前景気 but more commonly used in everyday speech.
Compound of 前 (まえ, 'before, front') and 景気 (けいき, 'business conditions, mood'). The exact historical derivation is uncertain, but it likely emerged as a term for 'future prospects' in economic or general contexts.