What engine is Rolls Royce currently testing?

I saw the Rolls Royce B747-200 test bed N787RR over San Diego yesterday, and I was wondering what engine they are testing. I know it is the Trent 1000 test bed, but I am not sure if they are still testing the Trent 1000. Anyone have any info? I did a quick Google search but I didn’t come up with anything.