Iran wants to replace f-4 fleet with su-30 so yes the purchase will be a large one.Are you talking about a separate order from the Egyptian 30 aircraft? The last report of 50+ showed 30 of those (of which 10 have already been delivered) were EAF aircraft and the other 20+ were most likely Algeria.
Or are you speaking of a different source? Can you link it?
That's what I thought and what we've been hearing for quite sometime in that the IRIAF really liked the Su-30 and was prepared to purchase a ridiculous amount of them just to instantaneously augment the air force capabilities.