Q. Will openSUSE Leap work with newer computers?
Yes - the first release of openSUSE Leap, openSUSE Leap 42.1, shipped with version 4.1.12 of the Linux Kernel, which provides very modern hardware support
Q. Is the Linux kernel/GNOME/KDE/something else older than the version is in 13.2?
No - openSUSE Leap 42.1 contains Kernel 4.1.12, GNOME 3.16.4 and KDE Plasma 5.4.2.
Q. Will openSUSE Leap work with older computers?
Maybe - openSUSE Leap will be built for 64-bit architectures only, and hence will not run on older hardware without 64-bit support.
Q. Why does it have such an old kernel?
See here for the explanation: Why is the kernel used by Leap so old?