Of course. Gameboy was a powerful brand that everyone recognized in 2004. Yet Nintendo comes in and announces the DS.
Imagine apple announcing in their next keynote that they will discontinue the iphone brand and replace it with "Apple PS". Do you think their investors would like that idea?
But in this case calling it Gameboy would have panicked investors too, possibly even more, because Nintendo was doing new and strange things with it. If they called it Gameboy they couldn't have made the empty claims that another Gameboy was coming, so no need to worry too much about this DS experiment.
No. From "absorbing the Wii U architecture" in a CPU/GPU context, I take it to mean there will be backwards compatibility with the Wii U.
When they mention CPU and GPU they're not simply talking about architecture. The CPU/GPU used in Wii were almost identical to the ones in Gamecube. If they were just talking about architecture then they wouldn't have listed this as the exception. If they were just talking about backwards compatibility they wouldn't have listed this as the exception. And if they were just talking about the difficulty in migrating between consoles and handhelds then they wouldn't have listed a console to console migration as the exception.
For something that's as unambiguous as you think it is we sure are reading it differently.