Caught this on a blog of someone named 'Kurisu'.
Updates on WiiWare
The word so far is keep it within 40MB max. Which is pretty tight considering the generation of console, but then again considering that it's a downloadable game... it kinda makes some sense. Hmm... I wonder if people will be able to SAVE these games on a card or HDD
The 16MB max. for save files doesn't seem too tight though. These are console games afterall...
Oh another forum thread I found too... has some other information.
Before I'm done here, you might also want to note that WarioWorld.com has now added the option for WiiWare on the Wii SDK application!
Check it out!