Gotta agree with your percypenn!
As a guitarist myself, I'd really like to see her utilize the guitars more in her future works. Kettobase and Uso got my attention the first time I listened to them thanks to the catchy riffs. Oh well, at least Beautiful World has an acoustic remix. You Make Me Want to be a Man would've sound so much better if the guitar solo from Utada United was included in the original track as well, but then again the length of the solo is too long for a pop album. I hate to categorize her under pop but I really don't know which genre she actually belongs to.

The keyboard / synth thing is okay, not that I hate it but I think it'd be really awesome if she uses more guitars.

Well I don't thin guitars are too common if she throws in some catchy riffs or great solos into one or two songs for her upcoming album. Then the album will be more balanced.

Speaking of which, has anyone here watched her performance of Be My Last which was shot from her house if I'm not wrong? Anyways it sounds good, purely acoustic.