Certainly a clever move to cater to the Eurorack scene, whether they will eventually introduce their own modules or not.
Well, yeah. Arturia had a strong presence in eurorack already, thanks to the Beat Step Pro being sort of the
de facto standard eurorack controller, so they'll be able to leverage their brand quite well. I'd be surprised if a "Link" dock for BSP wasn't in the works. And Arturia is more mainstream ("mainstream" here meaning "found at Guitar Center") than most eurorack makers.
Oh no, this makes getting started with Eurorack way to easy. Now I will have to start getting modules ......
First of all, yes... yes you will. But also, it's always been this easy. See Tip Top Mantis or Make Noise Powered Skiff for things that you can just plop modules into and go. But now, like I said above, you'll probably be able to just drive to Guitar Center and pick up a eurorack case.
While I think that the 6U pricepoint is nice, I'm not so sure about the 3U at $300 USD. I'd go with the Make Noise Powered Skiff, which is a little bigger and a little less, unless I really really wanted it to be connected to a MiniBrute 2.