There isn't much mention of *A RTWs on AFF simply because almost all members are tied with one world.
Some of us

do use these products extensively. Even though mileage based they are very flexible (some nicer rules than OW equivalent, global explorer), can earn much more than OW equivalent (higher booking class in economy), and *A has a wider global network than OW (australia and south america excepted).
On a single business class RTW I have earned enough for a round trip award in business class from oz/nz to europe. Try doing that on a DONE4 crediting to QFF!
FT's *A forum has the best info. I have some trip reports that include *A RTWs, including one from April. On
www.staralliance.com click on RTW mileage calculator tool. It isn't perfect but does a good job of applying the rules and schedules for mapping out an itinerary. You need an airline or travel agent to check availability - the tool doesn't do this - but there are some publicly available tools you can use to get an idea.
NZ Premium Economy can be included on a *A RTW, for a surcharge.
xRWSTARx rules effective 1 May 2007 said:
D. NZ Pacific Premium Economy upgrade surcharge on
AKL-LON/LAX/SFO and vv
AKL/CHC-NRT and vv
AKL-HKG and vv
AKL/CHC-KIX and vv
LAX/HKG-LON and vv
AKL-SHA and vv
AKL-SYD/MEL/BNE and vv
NZ Pacific Premium Economy is available for passengers
paying Economy RTW fare at a surcharge of USD100 for AKLSYD/
MEL/BNE and USD300 for all other sectors. Child/infant
discounts apply. The surcharge must be reflected as a Qsurcharge
after the applicable sector. No surcharge applies for
passengers paying First/Business Class RTW fares. NZ Pacific
Premium Economy is booked in E class. For the purpose of this
rule the following are considered two sectors AKL-LON and vv
(i.e. AKL-LAX/LAX-LHR) and MEL-LAX and vv (i.e. MELAKL/
AKL-LAX)
You can also upgrade SAS intercontinental flights to Economy Extra (for a surcharge), and both Singapore and Thai's ultralonghaul nonstop flights from Singapore and Bangkok to Los Angeles and New York have a surcharge. Flights which stop en route don't have this surcharge.
If you upgrade too many sectors you may be better off purchasing business class.