This is actually chicken and egg problem. There is no point to buy 3.1.4 if it is not full replacement of OS3.9 AND/OR there is no clear path to future.
Sorry to disappoint you. Just to make one thing clear: 3.1.4 is not supposed to be a replacement for Os 3.9. It cannot. We do not have Reaction, and a lot of other distributions for 3.9. Nor is it supposed to be. You can certainly install it on top of 3.9 if you like.
In particular: 3.1.4 will not come with Reaction. It will not come with Reaction-based preferences. It will not come with Genesis. It will not come with BenchTrash, ZipTools or ViNCEd. It will not come with AmiDock, WarpOs, the xpk-libraries or AsyncWB, or AWeb. There will be no MP3 player, no CD-Player, no AVI-Player. It will not come with the mmulib.
This is a bare-bone core operating system, same bare-bone as 3.1 was. If you need further components, you'll find plenty in Aminet. Actually, part of the goal is to leave "distribution building" to third parties, as we have really limited development capacity.
Furthermore, nobody is willing to guarantee you anything in Amigaland, how can we possibly do that? We're doing the best we can, that is all I can promise.
Thus, if you expect a new, fully blown distribution, you are wrong here. All I am going to promise is a bug-fixed release of Os 3.1. It was never announced as anything beyond that.
Thus, if you expect the best invention since deep dishes (as we say in Germany) - no, it's not. But it is the latest, newest and most robust deep dish anyone can possibly sell you. You probably have to fill it yourself, though.