>To clarify, are the previews and interviews saying that no "line" of units ever dead-ends?
True dat. There are a few lines that merge into others at some points and a few that start later on, but no line ever just dies out.
But as Graham said - you *do* have to pay to upgrade your units to the next level. The cost to reserch the upgrade isn't really that much by itself (it varies depending on the unit line), however it's worth noting that the upgrade cost includes the production cost difference for units "in the field" that you are upgrading. This prevents folks from banking ancient age units then suddenly showing up with a horde of expensive later-age units on the cheap.
True dat. There are a few lines that merge into others at some points and a few that start later on, but no line ever just dies out.
But as Graham said - you *do* have to pay to upgrade your units to the next level. The cost to reserch the upgrade isn't really that much by itself (it varies depending on the unit line), however it's worth noting that the upgrade cost includes the production cost difference for units "in the field" that you are upgrading. This prevents folks from banking ancient age units then suddenly showing up with a horde of expensive later-age units on the cheap.
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