In fact, I was so interested that before placing an order, I googled a bit to check its internals and make sure that the Chromebook Pixel could be upgraded.
Huh, soldered RAM, soldered SSD - ok whatever, what about the mini PCIe LTE card? Can I remove it and put something more useful in there? Nope - only USB is wired, so you can't put a mSata instead of the LTE card.
And I'm sorry, but that's a dealbreaker.
I would have got one if I could have put 16 Gb of RAM + a decent ssd, I might have purchased one with only 4 Gb - just like my current macbook air, as long as I could upgrade the SSD (like I did - on the macbook air!!), but with less storage that my current laptop and no possibility to fix that? No way.
I'll wait for a new version. If it provided ~0.5 Tb of SSD and 16 Gb of RAM, with the same hardware specs, I could spare with 2k USD - at least until the macbooks get touchscreens.
But trying to use the current model for the kind of development I do is just unreasonable. I need at least storage space, and I don't fancy the idea of travelling around with an external HD or praying for LTE connectivity.