As you may aware of this, since Leap, open SUSE has moved its codebase to SUSE Linux Enterprise (SLE) to offer Enterprise level operating system as FREE, like Debian & Cent OS.
Open SUSE Leap 42.2 is based on SUSE Linux Enterprise (SLE) 12 with Service Pack (SP) 2.
Also, why do vendors don't support direct upgrade path? My understanding is that everything that gets installed on SLES is through an RPM. Upgrading from SLES 10 (GA and Service Packs) or SLES 11 GA There are supported ways to upgrade from SLES 10 GA and SPx or SLES 11 GA to SLES 11 SP2, which may require intermediate upgrade steps: SLES 10 GA - They probably want to miminize the number of possible upgrade paths to reduce documentation and simplify support on their end.
Note that not supported doesn't mean that it won't work: I tested upgrading SLES10 SP3 to SLES11 SP3 without any problems... The direct upgrade path is implemented, but the support hotline may not want to talk to you about it.
Major versions are released at an interval of 3–4 years, while minor versions (called "Service Packs") are released about every 18 months.
SUSE Linux Enterprise products, including SUSE Linux Enterprise Server, receive more intense testing than the open SUSE community product, with the intention that only mature, stable versions of the included components will make it through to the released enterprise product.
Checkout this post to know beforehand how to upgrade your open SUSE Leap installation from 42.1 to 42.2.
Since then I went through 5 upgrades: from 12.2 to 12.3, to 13.1, to 13.2, to Leap 42.1 (in fact, there was a leap, as we have seen on that release's announcement) and this week to 42.2, even before it was officially launched.All the packages are coming from SLE SP 2, which are well tested at their end that offers additional level of stability to Leap which is unmatched by other Linux distributions.So you can blindly choose open SUSE Leap 42.2 as your primary OS among others (Especially, if you want to give a try apart from Ubuntu based system).SUSE Linux Enterprise Server (SLES) is a Linux-based operating system developed by SUSE.
It is designed for servers, mainframes, and workstations but can be installed on desktop computers for testing as well.The next open SUSE Leap release, 42.2, already passed alfa and beta phases and had its first release candidate (RC) launched on October 18. That release is very close to the final one, scheduled to November 16.