there aren't many unique designs of hypersonic weapons, be they cruise missiles or air-breathing final stages, or hgv's. there are three types of hypersonics which perform mid-course and terminal maneuvers. > hgv, basically a ballistic missile's final stage which is a glider that can change its course > powered hypersonic final stage for a ballistic missile, like the above but with an air breathing engine > hypersonic cruise missile, be it air breathing or a rocket, which does not go into a ballistic arc but hugs the ground we have zero.   milley is the source of the "2 days 'till keev falls' quote.   depends on the authority, really. wikipedia gets into it later.
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