I never really got the drive behind smart watches. If you want time, you get a $9.99 Walmart special. If you want some bling that also tells time, spend more.
I do not see how they intend to make a watch that could provide much more function that a calculator watch.
You can only use one hand to operate it, unless you have very dextrous wrists.
The display should be readable from about 12"-16" away so you don't have to hold it up in front of your nose to read it.
Even if it could display a whole tweet, you still need to pull out your phone to respond, re-tweet, etc.
You need to have your phone with you anyway, unless it is 100% stand alone AND small enough.
The iWatch idea with a lot of biometrics is a much better fit, with wider applications. Nursing homes could strap one to every guest and track vitals, monitor for other health risks and provide basic location reporting. Marathon runners would love a better / lighter tracker / pedometer that also tracks vitals and pace statistics.
I did own a calculator watch, it was handy but could not do much more than the basics. A full blown scientific calculation would be better, but again, size / weight is an issue.
Never mind what happens the first time someone dies / kills while playing with it behind the wheel. Look at phones and driving, major problem for some and law enforcement hammered it down pretty fast. Wait until its a 'watch' that can play movies/text/e-mail.
If anyone out there has a viable function for a device like this I would love to hear it, so far, no one I have talked to has come up with more that the MSP430 for pressing 'next' on slideshows.