I've talked specifically with one of our main suppliers about this, as they are planning on going to 75 square fabric as well. He told me a couple things;
First, it depends on the thread thickness as to how well it'll feel and what it will weigh. So that means there is good 75 square fabric and not-so-good.
Second, the reason some are going that route is that even though it is more expensive than 60 square, it's easier right now to obtain. It seems there's not as much demand for 75 square, so it's more obtainable than 60 square.
I guess we'll have to see what it comes in looking like...