What we know about Lockheed Martin's mysterious SR-72

What we (actually know in 2019) about Lockheed Martin’s mysterious SR-72: https://en.m.wikipedia.org/wiki/Lockheed_Martin_SR-72

Which is as far as I can tell, nothing more than what we knew in 2018.

Wow. A two year old video with no information whatsoever.

> for intelligence, surveillance and reconnaissance (ISR) and strike missions (wikipedia)

for the strike part, wouldn't it be better to use a satellite-based system, I would think it could reach any place on earth much faster given the initial velocity of being in orbit.

e.g. missiles/drones would be launched from a satellite at 8000m/s (17000 mph, 3/4 times faster than the SR-72), and they could be distributed globally. I'm just unsure about the descent phase but sounds like it would work out.

This is disappointingly little information.