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I did some tests with the intelligent digital zoom on the a7s and I'm pretty convinced it's some kind of sensor crop. My theory is that the processor is cropping into the 4k video to get the zoom as opposed to cropping into the 1080p video. So the video quality is actually really good. Here's a video showing some tests I did with it.

The A7 series cameras work well with just about any lens that can be mounted except wide angle rangefinder lenses wider than something like 24/28mm. What do you want to do? Wide angle? telephoto? normal? Do you like primes or zooms? Canon FD lenses are a fairly safe bet and you could get a couple of L lenses maybe for your money (or at least an L zoom and non L prime or two). Maybe a couple of cine Rokinon/Samyang lenses? Plenty of other choices. Nikon AI/AIS lenses are also great bang for buck.

It seems very interesting to be able to use this metadata for 3d tracking and adding models inside shots!

Very smart. It's the same concept as Instagram hyperlapse indeed. It shouldn't be expensive at all, the hardware is really cheap. The only downside over a gimbal is framing of course. You're going to have to shoot a bit wider than intended and crop afterwards. For 4K to 1080p this could be really cool. I'm not interested in the current stabilizers because of the price (and the bulk) But this little box could be a really cool addition for handheld action shots. I wonder how it will work in more 'normal' shots, like a substitute for in lens IS. Love the small for factor. Very stealthy!

All my research into this topic is here:   http://www.eoshd.com/eoshd-shooters-guide-sony-a7-a7r-lenses