I cannot speak on behalf of Oracle, but there's generally one template (exceptionally two) every year for each module. And so far it was about 3 to 6 months after the new Peopletools version GA.
So, if Oracle decides to continue with Peoplesoft OVM despite the VirtualBox appliance for Peoplesoft, I would expect them to be available in June at the earliest.
But, again, unless I missed some docs (which is quite possible), I did not see any evidence that Oracle will continue to deliver Peoplesoft OVM templates since there is now this Peoplesoft Update Manager images (VirtualBox).
I did a move from VirtualBox Appliance for Peoplesoft to VMWare ESX as shown here, so it should really be doable to Oracle VM.
As a hint, the delivered images are ova files, you may want to try directly the import of that files (or extract first the ova file, it will produce ovf and vmdk files that you can work on):
Find out more : http://docs.oracle.com/cd/E20065_01/doc.30/e18549/vm.htm#CJAJHDJC
If I have time in the coming days, I could also have a try from VirtualBox to Oracle VM.
Looks like this post entry is a good start for having a try :
But it seems you need VirtualBox installed somewhere to run the conversion... but it is worth a try.