I think the 100,000 year war is the on-going war between the Flood, and, well, everyone. More specifically, the forerunners and forerunner created things (such as the sentinels).
That February thing is "We'll see you on February 8th"
Oh, and I missed out that the Ark (most likely the Earth) is outside of the Halo's destruction radii, so any sentient beings in The Ark are not killed.
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