A source just sent me a surprising rumor. Samsung won’t make OIS lenses anymore!
According to the source Samsung has a little concerns about optical problems and final lenses size. Samsung will get back to an improved AntiShake system sensor-based used on Pentax/Samsung DSLR. The patent of that system is a share property between them.
I certainly hope the rumor turns out to be true! All lenses (including third party lenses used via adapter) will be stabilized and the size of NX lenses can be a bit smaller. At the time of writing Olympus only offers mirrorless cameras with built-in sensor stabilization.