I'm very much looking forward to the economic revisions, even if many details are speculative at this point. The plan, at least as far as the community can seem to agree, is to remove the tile system and replace it with more abstract populations and labor pools, while giving more options for said labor pools. For example, manufacturing was hinted at, which implies that raw minerals will have to be processed into useful materials before use now. I really like this idea, as well as the idea of luxury goods and the apparent stratified societies that the image above imply will now be possible.
A sizable minority of the posters on Paradox's forums seem to be mad about removing the tile system, but I really think it will be better once it's gone. It's fun for the first five planets, but it gets really tedious for little point later on. In my last game I think I had 37 planets in the core sector, all of them manually laid out and upgraded, which takes forever even if you use the shortcut to max upgrade a structure in one click.
The galactic market UI they've teased looks kind of plain and the mechanics a little shallow, but it's already much better than the trader enclaves. I'd have loved a system like it to be in place in my last game, where I couldn't seem to stop producing hundreds of extra food due to the sector AI. Selling that food for something would have been nice, and all my neighbors were too much of jerks for me to trade it to them. Seriously, I tried and they kept telling me to shut up.