how is...？和 how about...？有啥区别？

How's your brother?
(Is he ok?/Is he happy?/Is he healthy?)
How about your brother?
(If you and I are going to cinema tonight, and I know your brother loves movies, yet you didn't mention him; I tend to ask this question.)

how is是怎么样

how about是关于某事

how is...？
析：
How is he ?
他近况如何?

How are you?
[口]你身体怎样? (招呼用语)你好!
How is that for...!
[口]难道不...好吗! 多么...!

How 's that ?
那是怎么一回事?
你看(那件事)如何?
(板球)击球手出局了吗?

how about...？
析：
How about...?
(你以为)...如何?...怎么样?
How about that!
[口] 太好了!
er,not bad. How about you? 恩，还不错，你呢？