i'll be missing u ?????

｢I'll miss you.｣ 這句的時態是簡單將來式 (simple future tense)，而｢I'll be missing you.｣卻是用了將來進行式(future continuous tense)。兩句用不同的時態去寫出，所表的信息在層次上亦有所分別。

｢I'll miss you.｣ 是向對方表逹在兩人分別後，您將會掛念對方，但在這句子沒有顯示這種掛念之情會否會延續下去，亦未有指示兩人分別後是否會再相見，只是簡單地表逹｢掛念｣的感覺。

｢I'll be missing you.｣ 雖然同樣講｢掛念｣之情，但在感情的表逹上是比較深層的，它特別強調了這種｢掛念｣的感覺是有延續性的，這就是：｢在二人再相見之前，掛念之情是不會停止的。｣，由此可看到 ｢I'll be missing you.｣這句還隱喻著您很喝望日後再和對方相見。

I Will Be Missing U

你話緊我??
唔好傻喇,我冇咁無聊囉

您好，我推薦您一個非常不錯的英語學習網站，里面有很多非常不錯的學習資源，您能從中得到不少幫助：

http://www.hkenglishstudy.info

祝您好運!

These two sentences mean the same and both are correct in grammar except the writing format.
I'll be missing you = emphasis more than I'll miss you.

將來進行式，是用來說到一些在未來會進行或繼續進行的事情，如：
I shall be having dinner when you come back
（當你回來時，我將正在吃晚飯）
In a few minutes the meeting will be going on.
（過幾分鐘之後，這會議將繼續進行）

I'll be missing you（將來，我會繼續掛住你）
I'll miss you（我會掛住你）
兩者意思不同

詳情可參考古德明先生的解釋
http://hk.apple.nextmedia.com/template/apple_sub/art_main.php?&iss_id=20090328&sec_id=12187389&art_id=12560676&cat_id=2459955&coln_id=2459936

希望幫到你！

In fact,both I will be missing you and I will miss you are correct!
Have you heard of a lovely song called I will be loving you?
They use the same tense.

Let us start with I will be missing you first.
I will be missing you. = Future continous(progressive) tense
My teacher has told me before, if someone is so sure of something,then he can use this tense.

For example, I will be having dinner with my uncle at 8 P.M this evening.
In this sentence, we use I will be having dinner instead of I will have dinner because everything has been confirmed.

Like all future tenses, the Future Continuous cannot be used in clauses beginning with time expressions such as: when, while, before, after, by the time, as soon as, if, unless, etc. Instead of Future Continuous, Present Continuous is used.

For Examples:

It is incorrect to say While I am going to be finishing my homework, she is going to make dinner.
Actually, we should say While I am finishing my homework, she is going to make dinner.

For more details, please visit http://www.englishpage.com/verbpage/futurecontinuous.html

About I will miss you, it belongs to simple future tense. It is a tense which doesn't show confirmation!

For example:
I will move to China.
I will help you.
I will call her.

If we change these three sentences to the future continous(progressive) tense, things will turn out to be the opposite.

To conclude, we use I will miss you when you are still not very sure. If you are so sure of it , you can say I will be missing you.

i'll be missing u文法錯咗,而i'll miss u文法先至正確!
希望幫倒你!