I am excited by the possibility of having a larger selection of JVMs on AIX. I was bitten by having no alternative when issues arose with the one and only AIX JVM. Those were eventually resolved, but months went by and the fix was to upgrade to a new major version of the JVM.
It is comforting to know that there are several to choose from when using Linux on x86. My fear here is IBM will stop supporting the original AIX JVM so that now OpenJDK will be the only choice.