Did I miss something?
Yes and no

The article says he’s taking over Action with issue 1001 not 1000.
What they don't say in that link above, for some reason, is that his first story will be in Action Comics #1000
From the Forbes article - "Bendis will contribute to Action Comics #1000 on April 18, after which DC will release his 6-issue miniseries Man of Steel starting May 30."
And the fact he is bringing over his other work ... That just bug me for some reason. Why not just take it back to Image at this point? What happens if (when) after 15 or 20 years at DC he pops back over to Marvel? Is he going to bring it all back to Marvel? It's creator owned, it should have never left Image.
~He says not knowing the actual facts on the matter

Although truth be told, can anyone trust his creator owned stuff to even hit the shelves anymore? How many issues are still in limbo? How many titles left unfinished? I know things happen to make books late, but holy hell his stuff ... I mean imagine what Powers could have been he it would have came out even sporadically. But nooooo, just months without anything, then a "refocusing" on his part and a new number one and then ... yeah ... crickets again after a few issues.
I really enjoy his stuff, most of it, but there is no way in hell I would ever ... EVER ... again buy a Bendis owned comic in monthly format. Just can't trust him (or his team) to produce.
I know Jimmy is scared

but I am kinda looking forward to Action and Superman being different tonaly. Although I am sure there will be tons of talking heads, I think I would like to see a Daily Planet focused title like he is talking about.
Also want to see how he will fit in with the big two, Johns and Snyder, over the long haul. I think it is gonna be fun to see. I know Bendis is a "team player" (no doubt), but if grand plans start to conflict ... gonna be interesting.

That said I wish him and the rest of DC nothing but the best and I look forward to a lot of cool shit!!!