I don't know what it is called but I have seen people using the sentence which is the answer of some question as question itself.
For example:
You are going to play tennis? (this isn't much common still not
wrong)I am looking good?
You will prefer tea or coffee?
Is it just a new trend or some old style of speaking?
Best Answer
It is a perfectly usual way of speaking, which I have used and heard used over the last seven decades.
The interrogative is effected by a change in voice pitch, which makes it clear that it is a question you are asking.
In written form the question mark is essential.
It can, if not used with care, be misinterpreted as a statement rather than a question. For this reason it is often important to ensure you have the listener's full attention when you speak, and to say it directly to them:
'You will see him tonight?'.
'Yes'.
'Good, then I will let him know'.