That's probably what will happen, assuming interest appears.
Microsoft is shifting all their product offerings to "subscriptions", meaning they can screw with the product continually forever and you pay for it all along the way.
Consider Windows 10, which is also "not quite ready for prime time" in a number of critical respects. The underlying OS is fine, but there are so many things missing in the UI that it's incredibly frustrating at times.
I suspect the SQL offering for Linux will be like that. A slow evolution toward what it should have been at release.
But this is only a preview. I'll cut them slack for that. :-)
You're almost certainly correct. It's the first thought that crossed my mind. The question you have to entertain is, "Why would MSFT release it if it can't be credibly positioned as an enterprise tool to begin with"? What CIO in his right mind would buy that? They're not much in the habit of buying "toys" for their staff to play with any more.