Watching this on my own lunch, it looks like a an ECAD version of Autodesk's BIM 360. It's a concept where you can create MCAD or architectural or whatever designs, and then share them through a cloud service that allows others to examine and review those designs right in their browser. It's actually a really useful tool, and we use it to share concepts with clients for review of custom projects. Even internally, our mechanical designer can send me a link to a BIM project so I can quickly provide feedback on whether or not a mechanical layout will work with whatever I've developing, and I can do that without having to find the right file, wait for the CAD software to load, get to the right view, etc--or even know how to use the MCAD tool.
Being able to do that in the other direction, IE, being able to send a link to the mechanical designer and say, "hey, does this connector layout work with what you have in mind for the housing?" would actually be equally useful. If the mech team can mark up the board to point out that a component is right where they want to put a reinforcing boss, then that's even better.
For parts, if they can leverage their acquisition of octopart to make something that does what ActiveBOMs are supposed to do but is actually powerful and easy to use, then that would be really awesome. I would really prefer for that data to be able to be synchronized back into my component dblib, but I don't know if that will be practical. If they can create something to replace dblibs without losing any of the advantages of that model, then I'm definitely interested. Really I want to be able to easily link and manage supplier data into a library that has sch symbols and pcb footprints that I can control so that they don't suck.
Also, having an activeBOM-style tool that can be used to easily update supplier data for repeated builds (especially as capacitors are going non-stock or NRND left and right lately) would be really nice.
The ECAD/MCAD thing is interesting, but in theory they have it already--from what I've seen, though, it's painful and/or fragile in practice.
The two big questions, of course are 1) Whether this will be available for a price anyone is willing to pay and 2) Will it actually work half as well as they say it will. Knowing Altium, those a very much open questions right now!