I've noticed this flickering too - glad to see I'm not alone. It's very pronounced on some random cluster maps where there's a nebula cloud in the distance and against the stark black background.
And as for the "planets filling up": first time I saw that, before I got closer and just saw the silhouette crescent of the planet I thought it looked really cool! So disappointing when I got closer and it filled in.
I am experiencing the same problems as everyone else. When I updated my graphics software, the textures went bad. This is the only game it has affected. I will have to stay tuned to figure out if this issue will be resolved or whether I'll have to revert back to an old update.
this driver fixed or minimized the current issues with the game, its not a driver issue per-say because I have seen it on amd and nvidia cards, something in an update was bugged, the above driver is beta, but its worked for everybody whos tried it (nobody I know has complained and nobody here whos tried it has complained)