Some ancient civilisations such as Greek, Roman and Egyptian have not survived till modern era and some modern civilisations such as British, American, Persian, Russian, Japanese, emerged later but alive even today. Some more popular cultures flashed in-between i.e. they were neither ancient not did they survive till the modern era - such as Aztec, Mayan, Incan, Mongolian etc. And then there are India and China that witnessed both the ancient and modern times. Hence, while the civilisations in the previous versions of the game were good enough, one addition that needs certain inclusion is India and after that any other that you may deem fit. After all, you cannot ignore 1.35 Billion Indians forming 18% of world population having more than 20 widely spoken and written official languages with the most spoken Hindi at 320 Million and the average of 7 to 8 million, each having distinct and ancient history and culture. Even 5 million is more than the population of many other present day countries that AOE already has. So, for the love of AOE, do not miss India in AOE IV.