My guess/hope...
This is aiming to be GMail + Google Now for the enterprise. Something that will parse your mail, schedule and contacts to generate suggestions or reminders and create an easily accessible "context" for each.
A workplace client that can generate 'cards', reminders and contextualize common bits of information (Think UPS tracking numbers in GMail - applied to support tickets, physical sites, projects, POs and budgets in an enterprise) with the creepy accuracy of Google Now would actually be interesting - yet another take on unified communications or a skin deep re-imagining of email would not.