I've only just seen this (a bit late to the party). I think this is a great move for Automatic. I can completely see the sense in it, especially as WooCommerce is starting to dominate the eCommerce space.

From a WordPress users perspective this can only mean good things to come as tighter integration between them is bound to result. Hopefully, this will mean both WordPress and WooCommerce improving terms of capabilities and efficiency.

From a designer / developer perspective, I'm sure more hooks will become available and greater customisation capabilities will start to appear in plugins and themes.

All-in-all most sides of the WordPress community should experience some positives from this.