I'd wait for v2.0.
Broadwell is a stop-gap release, so I'd be waiting for Skylake, especially if I didn't urgently need a new computer. Secondly, the revised model would inevitably include at least 1 more port and perhaps a few other additions, not to mention much better battery life as 9 hours is not good enough.
It's a great machine and I can see it selling very well, but I'd be a little annoyed buying this knowing in the back of my mind that you should never really buy version 1 of anything Apple produces.
If nobody bought version 1 of any product, there would never be a version 2..
I am planning to buy it. I don't really need it, but I love gadgets and this thing is simply amazing to look at and hold. I will use it on the couch and in bed mainly. The Macbook will replace all iPad functions I would ever need. This is the perfect device for me.
I don't care about the lack of ports and battery life, if it's really 9 hours, should be more than adequate for me.