Assuming both embryos develop, there will be two chicks. Search it in the search bar and you'll probably find some posts about it. The one I remember reading about was one that both chicks hatched and turned out to be a pullet and a cockerel.
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) https://www.backyardchickens.com/t/104245/double-yolker-yolk-hatched-video-p-16-13-week-pics-p-51 They actually hatched two double yolk eggs, but one of the chicks from one of the eggs didn't make it. The other egg had a cockerel and pullet hatch from it, and they updated about all three hatchlings at 13 weeks old on page 51 of that thread. So not identical twins, but twins in a sense, I suppose. 
Im so sorryThx everyone. Unfortunately my leghorn passed in my arms this evening. So sad. I tried the vitamins and electrolyte in the water even with a dropper. I felt so helpless, my first loss. I have a RIR, EE,, Salmon faverolle and meal maker left. They are drinking and eating fine.
I'm glad everyone arrived! And for as much as you spent on 3 chicks I would hope they sent you an extra! Mine are still driving around in circles in OH, Last update was around 7 tonight and they were in Columbus.. I'm starting to think my hubby is right, we are gonna have some dizzy chicks if they ever get here.
sorry for ur lossThx everyone. Unfortunately my leghorn passed in my arms this evening. So sad. I tried the vitamins and electrolyte in the water even with a dropper. I felt so helpless, my first loss. I have a RIR, EE,, Salmon faverolle and meal maker left. They are drinking and eating fine.