"Best. Game. Evah. "Just one more turn...""
Sid Meier's Civilization is the poster child of the "just one more turn" game. Many nights have been lost as players say "oh, it's only 1:00am, I can have one more turn".
This version is no different.
The great things about previous versions have been left alone. Research, exploration, diplomacy, wonders - they are all there.
What is added is a better map (hexes are just better than squares), better city maintenance (cities can work hexes further away that before), simpler information on-screen about resources and resource use., city-states (computer controlled cities that you can bribe or conquer - often they are petty and vindictive) and far better combat.
You can not have multiple military units in the same hex. Ranged units however can bombard enemies more than one hex away. This means you have to accompany melee units with ranged units. No more stacks of tanks. This means that attacking a city on a penninsula is really difficult.
If you like these sorts of games then you already own Civilization V. If you want to get into this sort of gaming then you need to buy this game. Just be prepared to see tens of hours of your life dissappear.