Did you read my post Ash?
It was stated that BB's offered no advantage in any conditions, therefore Schumachers would be run in wet or dry.
However if GRP/Schumacher was chosen we would still run Schumachers in the wet, BUT the racers would have a choice of tire to run in the dry of GRP or Schumacher.
On a related note, is it confirmed that GRP are working on a wet compound? Also, is it confirmed Schumacher will have a NEW tire mould? As I feel both of these questions should have been asked before tire choices were made.