We need to start thinking and talking about what approaches we're going to take in Drupal 8 with regards to design for mobile.
My own opinion is that we should probably be looking really closely at responsive design and how we might apply or adapt the patterns emerging in that field. The idea of "one web" and a unified design and user experience independent of device appeals to me. I don't want an impoverished mobile experience, so please don't assume what I want to see or do just because I'm on a tablet or handset.
I want to pose another, more radical question - is desktop design as we know it fundamentally flawed? Are we are somehow approaching mobile design with a view that the desktop is a "solved" problem, when in fact the problems are not solved and we actually need to rethink "web design" from the ground up?
Should we be designing for mobile first or is this a complete misnomer - how can we differentiate between the needs of the mobile user and the desktop user, is this even possible? Can we be so brave as to make such drastic assumptions?
These are pretty high level questions, yes, but they (amongst other ideas) should underpin our design for mobile approach. We need to figure out what our approach is going to be and how we're going to solve the ensuing issues.