Injustice still works with Oman.
1. Create an Oman email account on outlook.com.
2. Go to Xbox.com and sign in with the Oman email account. This'll create an Oman gamer tag.
3. Turn on Xbox and DL your Oman profile with the email account.
4. Set your locale to Austria from the settings in the dashboard.
5. Sign out of all accounts.
6. You should see a Fifa 14 ad and then batman or superman below it on the main page (still not signed in).
7. Click batman/superman to see the WB sale page. Injustice should show as 30% off.
8. Login to your Oman account.
9. Click the injustice icon and download for Free.
10. You'll need to stay logged in as Oman while the DL finishes.
11. This just worked for me 15 minutes ago in US.
This is key. When I got Injustice yesterday, I didnt know this. I just clicked on the first ad...which was this and it was the right one. And it was easier for me to make up an email address from gmail. I didnt know you could do that. I thought all email addresses had to be MS ones.