re: short wing/long wing
AFAIK the 'long' wing of the F-111C/G is the same as the 'short' wing of the F-111F but with a tip extension. Therefore the RAAF had the option of keeping the 'short' wing (and gaining speed/reducing stress loads) or reinstalling the tips to go back to the 'long' wing (and thereby retaining range performance). I understand that the latter choice has been made.
It should be noted that the RAAF bought a handful of F-111As (short wing) a while back which were converted to long wing Cs.
As for pylons, some Pig nut will probably correct me, but I thought that all Pigs were built with four wing hardpoints, but they were only ever used on the FB-111, and then not much because the outboards don't swivel with the wing.