No, this definitely is no hint on forthcoming iMacG5 support within MorphOS ...

Although the chances of iMacG5 support are better than ever with the MorphOS improvements that have been done in context of the introduction of PowerMac7,3 compatibility, personally I'm still not convinced to expand support to each and every machine that can't hide behind a tree quick enough to avoid getting supported by MorphOS just because we can ....
So let's see how well received the current G5 support is in the next few weeks and then there is a slim chance of supporting devices like iMacG5 or other G5 models ....
MorphOS definitely is in no need for more PPC hardware options IMHO - there are plenty of options now, albeit "used" ones.