Fallout 3 was voluntarily excluded from Indian market because of the 2 headed cows. So I wouldn't be surprised if Fallout 4 is also excluded due to some silly issue.
I don't know if anything has changed of late (region locking for ex.) but I got FO3 1 week after its original release on Steam simply by asking a friend abroad to "gift" it (I paid him via PP) to me.
The same might be true of FO4 as well should the Pub decide not to release it on Steam for Ind...