I can understand ARM, Samsung, T.I. and others working together to push their embedded platforms/tools/chips.
Not sure what IBMs reason is, though. Do they sell embedded devices/chips?
Also it does mention "Android, LiMo, MeeGo, Ubuntu and webOS". I suppose this will lead to some better driver support on the linux side and very lowlevel tools to support/push development of those operating systems on ARM platforms.