Tsvetanov, welcome to openSUSE and welcome to our forum.
openSUSE has been evolving the past few years … and some explanations.
Up until openSUSE-13.2 (which is the current released openSUSE, at least it will be for the next 2 weeks) the general development had been a new openSUSE release every 9 to 12 months, the latest version being openSUSE-13.2. My understanding is the older openSUSE (up to 13.2) is nominally packaged by SuSE-GmbH in Nurmberg with support from the openSUSE community. The typical practise for maintenance of openSUSE was that security fixes would be immediately addressed with updates, and major/blocking bugs would be immediately addressed with updates, but very minor bugs and new features were not updated in a release. Instead for minor bug fixes and for new features, one had to wait for the next openSUSE release.
Further, in addition to packaging openSUSE, SuSE-GmbH packaged two ‘commericial’ GNU/Linux distributions similar to openSUSE, which are SUSE-Linux-Enterprise (desktop version and a server version). These are often referred to as SLE (SUSE Linux Enterprise). The desktop version is often called SLED (SUSE Linux Enterprise Desktop) and the server version called SLES (SUSE Linux Enterprise Server). Both SLED and SLES are supported by a different forum and not our forum. SLED and SLES have longer maintenance life provided by SuSE-GmbH than an openSUSE version has maintenance life (up to v.13.2 of openSUSE). However SLED and SLES tend to be a bit older wrt the date of the underlying OS and older wrt their applications.
In parallel, in response to a community desire to have more up to date openSUSE versions (that were still stable) with feature enhancements, and not have to wait for the next openSUSE version, a new packaged version of openSUSE called ‘Tumbleweed’ evolved. Tumbleweed is what is known as a ‘rolling release’ and as there are new versions of applications, and indeed new underlying core operating system versions, once they reach a reasonable level of maturity they are applied to the “Tumbleweed” openSUSE version. A large % of the Tumbleweed packaging is done by the openSUSE community, although again my understanding is SuSE-GmbH provide significant core support for “Tumbleweed”. Tumbleweed was typically based on the last openSUSE version, but with enhancements.
Hence for a while there was the ‘nominal openSUSE (such as 13.2)’, openSUSE Tumbleweed, and also there was SLED and SLES. But this has now changed.
A decision was reached to bring ‘openSUSE’ closer to ‘SLE’ so to gain synergy from the two parallel efforts. Thus the new version of openSUSE, to come out in a few weeks time, will be openSUSE LEAP v.42.1 . They chose a new version numbering, as the change from the older SLE/openSUSE to this combined variant for the new openSUSE, is a significant change. The idea is to use the core very stable SLE packages for the core openSUSE LEAP Operating System, and use the community packaged applications for many of the openSUSE LEAP applications. Hence openSUSE LEAP and SLE will be much closer in terms of compatibility of applications which has significant synergy and increased maintenance life possible for openSUSE LEAP.
At the same time, Tumbleweed will continue.
Hence from early November onward, there will be openSUSE (LEAP version and Tumbleweed version), and SLE (SLED and SLES versions). On our forum we plan to support wrt help (from our many volunteers) both LEAP and Tumbleweed (but not SLED nor SLES).
At least that is my understanding and I hope that clarifies this for you.