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.