Do people think that there'll be a range of different wearables then? I've seen it mentioned a couple of times, but it doesn't seem very Apple-like to release a bunch of different 1st Gen products at once, usually they're all about "this is the best way to do things so get on board". I certainly don't think there's going to be much variation on the body of an iWatch, too much work for developers to design for different screen sizes etc. More likely they've worked out which works best for them and will be mass producing it. Don't get me wrong, I wouldn't mind having options, but it's not like Apple to hedge their bets, it makes them look unsure of what's best.
I'm expecting two sizes. Apple haven't made anything like this before - it's quite different to a portable/pocketable device. But even with those, I'm sure you'd see some clear trends in the sales between male and female when there are size options, i.e. the smaller MacBooks/iPods/iPads being more popular with females (on average). Of course every Apple product is unisex, but there are practical reasons why smaller versions would be preferred by women in many cases. While it's true that the first gen doesn't typically get two sizes, almost all Apple's products now come in multiple sizes, and iPhone is one of the last to receive that treatment.
With wearables this goes a step further, with the average wrist size being smaller on a female, and because there is a significant variation in wrist size within males and females, as well as by country. If they really want to knock it out of the park (unlike everyone else who's tried so far), it needs to be something that the vast majority of males and females across the planet would like to
wear. It doesn't matter how useful it is, it will be seen as a fashion accessory, more so than any previous Apple device. This is a daunting task, and I don't believe it can be achieved with a single model, no matter how many wrist-strap variations you can offer. The vast majority of desirable watches have male and female sizes - most jewellers even label them as 'gents' and 'ladies' watches. I expect Apple to make two sizes but not label them in this way, as they could be designed so that both sizes appeal to both sexes, just like the two upcoming iPhones.
The counter-argument is that you see plenty of women using massive phones, and there are many deliberately-oversized timepieces designed to appeal to women, but I'm talking about averages here. It's also not that feasible to make a smart watch as small as a lot of 'ladies' watches - they are often deliberately tiny and we're expecting battery life to be a problem already. If they couldn't make a smaller version small enough, they might have given up on the two size idea early on. But I reckon to do it properly, it needs two sizes, and I wouldn't be surprised if this is what has caused the delay (i.e. every feature/spec had to work on the smaller design).