Hi everyone.

I have a question. 

Ankaraya donuyormusun?

Does the sentence indicate a future tense?

Can "yor"´form of the verb indicate future?

Question form should be "Ankara´ya mı dönüyorsun ?"

It´s present continuous tense.

Sorry I made a mistake.

The correct context is this:

Bugün Ankara"ya donuyormsun?

My question is, can I use "yor" for future events?

It´s present continuous tense also.

"Yor" means to be doing something now, or starting something now, or at least within the next minutes or so.
Are you going to Ankara?

If someone means to say "Will you be going to Ankara?" or "Will you go to Ankara (next year, next week)?" specifically in the future, they will use ecek/acak.

In English you could maybe say: "Are you going to Ankara next week?" (for example there is an event) but in Turkish you would generally use ´ecek/acak´.

You can easily use some tenses instead of other tenses in Turkish. This is called "zaman kayması/anlam kayması (time slip/meaning slip)". So with present continous tense you can mean future. There are other possibilities too:

Present continous means future:

Yarın geliyorum.

Present simple tense means past:

Maça gidelim derler ve giderler.

Present simple means future:

Yarın gider.

Present continous means simple present:

Her hafta sonu sinemaya gidiyor.

http://dilbilgisi.gen.tr/fiillerde-anlam-kaymasi/

of course you can. The only condition is that, as in your example sentence, you must use a time word such as "tomorrow," "this week," "next year" etc.

yarın eve dönüyorum.

bu hafta Antalya´ya gidiyorum.

bu akşam dışarıya çıkıyorum.

seneye İstanbul´a taşınıyorum.

pazartesi günü işe başlıyorum.

2018´de emekli oluyorum.

I got it.

Thank you very much everyone.

Sorry one more question.

İstanbula yalnız mı gidiyorsunuz? 

There´s no "time word" in this sentence

So, how can I understand whether it´s" present continuous" or "future"?

It´s present continuous.