So full disclosure it's not my genre either but I do love 40K and the game looks great, I will give it a go. I'm also not a Star Wars beyond enjoying the first three as a kid/teen. I read all sorts of shit about Disney pissing off fans though.
As for the IP, Warhammer is getting pretty big. You could read a 40K book once a month and go 50 years with lots of books left. There are also more and more video games (and really there have always been a lot of Warhammer video games, the list is somewhat shocking actually), including truly great ones across multiple genres like Rogue Trader (classic turn-based CRPG), Chaos Gate Daemonhunters (XCOM2-like), Gladius (4X), Battlesector (table top-ish skirmish/campaign game) and Mechanics (TBS that sold well enough to get a sequel). And those are just the ones I own and would recommend, like I said the list of Warhammer video games is crazy long.
Finally, Henry Cavil doing that 40K show for Prime is going to be what pushes it over the top. I've heard that could fall through but I think there's too much at stake for the IP to let that happen, we'll see.