It's not only that the demand is weak, but really, it's that the series is complete. Every other series right now in Smash (sans: Ice Climber, Third-Parties, ROB, Pikmin, and G&W... And probably Yoshi/Wario) can easily have a newcomer, but frankly, Waddle Dee is generic. Though, I will agree with you he's worth the analysis.I actually say A LOT about Waddle Dee in my analysis for him. There is also an extensive non-contender section for Kirby. You are right that demand is weak for a Kirby newcomer, however, it is certainly a series worth talking about.
The thing about the Zelda analysis is that I may have to go back and make edits to it due to announcements and new information that happen at E3. That may take a while considering how much is written for the Zelda series analysis.
I may not even post a new series analysis during the week of E3 (though I certainly will post one during the week after). The new information about Smash 4 and new game announcements and information, will give me a lot to consider for future analyses, so I would probably have to hold off for that week.
Will you have Daroach in the Non-Contender's section?
Honestly yeah, take a break because some characters might be confirmed and we might get new information (I.E. 3DS having different roster but you can transfer roster) which could really swing the game.