I have a feeling the PP tested by PQIA in 2013 was already using a GTL base because it's virtually identical to PPP.
I hope they'll test PUPP soon since it had the highest spike in NOACK and supposed to be higher than PPP.
Just did some digging and the Shell GTL pearl plant started shipment in 2011 and was fully capacity by 2012: http://en.wikipedia.org/wiki/Pearl_GTL
It's very likely that PP & PU manufactured 2-3 years ago is already using a GTL base.
PQIA has done 10W-30s and straight 30s.
Focus is placed on the largest selling grades, and often presented in grade themes, e.g. a set of 5W-30s or a set of 5W-20s. Less common grades will have their turn again.