Hi, good question. Our PC/table users are our main visitors and #1 priority for the new layout as well, so it's not "only mobile" but more like "flexible layout". We cannot upkeep more then one layout, since keeping up 2 layouts would mean 2x work... and it would also be confusing experience.
Main goal for PC: support bigger screen sizes (meaning: no fixed width, more viewable area). There are increasing number of people with 28" screens. Also bigger buttons and touch scrolling for touch displays. Also support for super-small window sizes, if someone likes them.
Tablet: support for browsing both 8" and 10" tablet, both horizontally and vertically.
Mobile: make text big, collapse some fields and arrange them vertically and not horizontally. Remove some uninformative images/columns in case the phone resolution small and used vertically. Show them more if phone turned horizontally.