As you know the US sales are only about 5% of the European market.
That already determines what will be in a KB for the most part.
Obviously they will listen to the Europeans before the US. Sad but true.

being european, i am not said.

but is only partially true. do you think yamaha, or roland or any other manufacutrer really have to talk with the musicians on the forums to realize what they should put into their arrangers?!
i am sure they have pretty good ideas! but they need to "listen" to the buyiers, so they do.
anyway, they'll never put all the best features, or the total of them into a single unit. that unit would then be their last model!!

what about us, people on the forums, trying to create a kind of styles data base. i am sure alot of us here have the ability and talent to actually create styles, right from scratch. if everyone who loves hip-hop for instance would contribute with one original style, soon, we would have several (different) hip hop styles. especially since you can do that pretty easily using a good soft seq like cubase, and with the arrangers that are now on the market - and the future models - couldn' t too hard.
and so on...