Kumabjorn, I am not a Scrivener user or expert, but - based on what I do know or have read - I make the following observations:
The Windows version of Scrivener has always (and I expect will always) trailed behind the Mac version. Scrivener was originally developed for Mac, the Windows only started when the product became popular so it's been a long time catching up. The Windows development is quite separate to the Mac development - though, apparently, the project files are compatible across platforms.
I imagine you can expect the iOS version to also trail behind the Mac version ... although it turns out that the same person developing the Mac version is doing the iOS version - so it may not be that simple.
I did find this on the L&L blog: "
When the iOS version is released, there will be simultaneous updates for both Scrivener for Mac and Windows that provide sync features. So don’t worry, Windows users, we have no plans of leaving you unable to sync!"
You may find it interesting to read some more relevant posts from the blog
here.
I would expect the iOS licence to be a separate purchase (just as the Windows licence is separate to the Mac licence) - although they may offer discounts, particularly early on.
I believe the Windows version has every intention of trying to catch up with the Mac version, but unless you've seen promises of a v2 for Windows coming soon, I'd would not hold my breath waiting. These things can take a long time.