Yes, this isnt a full MMORPG but secondary utilization component for when the players HAVE to be away from their gaming machines, but still can fit in some(many?) minutes here and there during their days to offload more mundane game operations (interesting the WOW has auction house access - of course of anyone they had the money to develop/add that feature). The time offset also plays into some game mechanisms where things 'grow' with time and players periodic attention could be utilized.
The mini-games would mostly be chunk Download and Play, because of the connection difficulties which really arent going away (plus maybe the minute cost for a subset of the users.)
2D 2.5D interaction could be run on very low end systems (platform compatibility issues of course) Resolution used for 'pretty' versus pixel search or high accuracy aiming.
3D for the more powerful ones (and for midrange in the future timeframe of several years) and it sounds like quite alot of decent performance will be there for that eventually.
One of the design features is Players having a personal NPC Team to do more tedious things which the player coordinates -- not micromanage (and somewhat better AI to make them do things needing to be done if player opts out ) So checking regularly the progress and redirecting tasks would be part of the use (benefits in the FPS-end PC/console priimary game).
The Player Created Content aspect would allow for many more Mini-games to exist (and even more scenario creation for existing ones) Again the activities feeding back results of the play effort into the primary game. Various media creations within the game (like choreographed flashback 'experiences' ) would be another item delivered by tablet/smartphones (minimal interface interaction and lump/bufferstream downloads)
Another issue --- the data allowance some of these device connection service deals have (competition will largely ( ? )) fix that driven by the normal media people watch thru these things)
The MMORPG Im forseeing is not the FPS on a bigger map most MMORPGs are these days, and wont be a big hit with attention deficit 14 year olds, but have a much higher detail and interactive world (the Player Creation part adds alot to people starved of ways to employ their imagination).
The tools/modularity/player dev involvement themselves could make niche genere MMORPGs more likely by bringing down the costs (Seriously, companies HAVE to break out of this spiral into dumbness/pablum weve seen happen).