This is purely my personal opinion as an old tabletop gamer (like the millions of others that play the bajillions of games out there)...
GW's new angle is something they must have been brewing for years (2-3 at least) - the scale of production and product release schedules they're working to take a long time to both set in motion and implement. So I'm absolutely sure that the open nature of the initial AoS release and free downloads for the old armies is purely coincidental to anything else happening online at the moment. (I've seen several different game fan bases saying that they were copying such and such for offering free downloads etc).
I've played AoS - it's a fun game in many ways but it's not what any long time players of it's predecessor would recognise as their old favourite and I can totally understand how some may feel about it. (I don't understand the really extreme reactions though - the old figures and books haven't magically disappeared - they're still usable).
I think what has caused the huge divide in opinions is that the setting and the mechanical system for the game has been totally reinvented. With a player base as huge as GWs it was bound to have a huge impact on a lot of people. Our hobby is where we go to relax, escape or enjoy a bit of creative work. If part of the enjoyment of it for some is a regular feed of 'new stuff' in a stable, comfortable environment then having that taken away probably does hit those people hard. If competition was a big part of their hobby it'll hit even harder as the 'official' environment has totally altered.
In my humble opinion AoS is fun but it's a totally new thing and nothing like what came before so it's not that comfortable, well-known place that many may have used to relax.
For a company the size of GW they look at the attraction of new customers and customer retention in numbers way beyond what I can guess at and I imagine all of those numbers and calculations went into planning for such a huge release. They've got huge market reach which is a massively powerful boon when making such a big change in a market where customers get emotionally attached. You'll lose a proportion of your longstanding followers but will be bringing in a whole new group of customers to build brand loyalty from in your new system.
Open Combat is it's own animal and to answer your question, it's simply Open Combat. I'm not calling it 1.5 or 2nd ed or anything like that as the rules are stable (and have been for a very long time). A minor tweak to how the bonus for attacking the rear is handled is all that is altering rules wise between the current PDF edition and the printed edition (and closely followed updated PDF). Everything else is additional content. The KS has sped up the process to getting it into print and allowed for additional material that would have been split across several supplements to be incorporated into the core book.
Open Combat is a very different play experience to AoS - its all about the individuals and the warband acting in coordination.
I've seen people saying AoS is a skirmish game now but after playing it I really don't see that being the best way to play it. You're much better off playing with huge armies for a good few hours in AoS than with a handful of dudes (which is what a big miniature manufacture would want you to do).
Open Combat is where you can get a hobby gaming fix in a short period of time with the drama performed by the heroes or villains you've invented.
EDIT: Moved to different section on forum.