So I found out that the "Wii Mode" of the Wii-U can be softmodded, just like the original could (with some changes).
Because of this, I was really able to notice the difference between the Wii and Wii-U when it comes to picture quality, etc. For example:
-The Wii-U's "Wii Mode" displays at 1080i, even though the resolution being showcase is the games' native resolution. I checked my TV's "Display Information" for the Wii-U's Wii Mode and it does not say "480p", it says "1080i". The Wii-U's native mode is 1080p, btw (in case you guys did not know).
To put it in simple terms, the Wii-U is 'upscaling' the Wii's resolution.
It is NOT UpConverting (sadly), just basically resizing the screen to the new resolution in the hardware/software, and displaying it to the TV on its HDMI Digital Connection.
-The Wii-U's "Wii Mode" is, as a result, 'crisper' than the Wii mode, even if it's the same pixels being displayed.
I noticed that there's no more color bleeding happening in Wii titles. This is (obviously) because the new connection to the TV is a digital one using HDMI, but it's made VERY apparent when playing homebrew. Holy crap homebrew is pretty. I am playing Mega Man III on HBC on Wii on Wii-U, and the blacks are blacker and the brights are brighter. An interesting side-effect of the digital connection being upscaled is that there is no true flickering when playing games on FCEU-GX. If you were to pause a game when a flicker effect is supposed to happen, you will spot the interlacing (and micro-scanlines) of the 1080i connection, which creates a pseudo-transparency. Ha ha!
-The Wii-U's "Wii Mode" homebrew's graphics end up using even cleaner pixels now (again obviously).
-Polygon games (Wii titles), though are virtually the same in terms of resolution, have better colors (though at times look slightly washed out, can't be sure why that's happening though), especially dark tones. Anything that looked like a black splotchy mark on Component 480p looks Jet Black on Upscaled 480p-to-1080i.
This pretty much means that my Wii-U is now equally as capable to play homebrew (and USB-HDD Wii games) as my Wii is.
I just hope at one point they either crack the Wii-U's native mode, or give us a method of using wireless controllers on some sort of odd Gamecube emulation on Wii on Wii-U, as (again, obviously), the Wii-U cannot play Gamecube games for a number of reasons (no controller ports, no memory card slots, no mini-CD reader on the slot).
So yeah, I just thought I'd share.