Between the time when the kickstarter was announced on stream till now, this js what I've come up with (I'll probably think of cooler stuff later on and/or look back on these suggestions and facepalm)
Initial Plans (this is just my interpretation)
*New 3D Platformer (universe?) with an old feel but a new look
*Veteran 3D Platformer designers and programmers reuniting for passion project
*Many new worlds to explore, many new characters to interact with and many new things to collect
*Platforms: PC & WiiU
Stretch Goals
*Increasing the amount of content: the amount of worlds (assuming that is how it ends up being structured) accessible in the game, which in turn means more characters and music etc
*PS4/XB1 Versions (I'd personally play the game on PS4 if given the choice personally, but I understand there is a legacy thing so I understand people wanting it on Nintendo platforms specifically. I want the game to be successful so I'd like it on at least one of the other consoles in addition if its possible

)
*Vita version (no way this happens but I'm just gonna throw it out there just in case. This is the last platform you should be worrying about though as much as I love the system)
*Simulatenous release across all platforms (preferably not have to be a stretch goal but hey, we're talking realistically here)
*Amiibo support (not necessarily something I'm after but it seemed really popular when you mentioned it on stream. Whether or not this includes your own set of amiibos, just the one that could be included in a certain tier. Whilst I think it would be cool for having support for current amiibo, maybe in the Mario Kart 8 style of "have some silly clothes if you put an amiibo down" but that's not very realistic. I don't know, you guys can probably think of something cool)
*Some kind of local multiplayer? (at this point we have a companion character, maybe if there is Banjo and Kazooie split type mechanics that another person could control them? Obviously you can't have puzzles based around it, or maybe its just the companion character pointing out collectibles or attacking independantly of the main character though still attached obviously. I dunno, just an idea)
*Themed worlds (okay, I'm not even sure this would even be possible, but Shovel Knight got me thinking that maybe if enough money was raised a themed level on each of the platforms could be done. For instance the WiiU version could have an area that resembles a mario level, the ps4 version having a LittleBigPlanet or Crash Bandicoot level, and XB1 having a... I'm not sure I should suggest a Banjo level cause I don't think that would be realistic, something, I'd love to see Conker and Chris Seavour in garble speak mode somehow. PC would be harder to pin down so I'd have to think about it more. The inspiration for the idea actually came from me wanting to hear Kirkhope interpret other themes in his style, and whilst realistically this is unrealistic as hell considering the monumental pain it would be to develop multiple levels if maybe the area has sort of a common skeleton about it with maybe just the art and characters being themed? I don't know. This is like 400-500% of the funding amount level but I think it would be a fun idea and something maybe someone hasn't suggested yet)
Tier Rewards/Miscellaneous ideas
*Name in the credits
*Branded merch (plushes of characters considering the style and type of characters would be nice, other things like keychains and miscellaneous things)
*N64 cartridge replica (I hadn't thought of this until it was brought up here and I think its an awesome idea. Having each numbered like the recent 20th Anniversary PS4's would be awesome, and having the download code embroided on the back or on the inside for the platform of your choice would be super rad. If this was like a $50 tier I can imagine that tier disappearing FAST.)
*Backer secret room (I saw this mentioned earlier and I think its a neat idea, a secret room that pays tribute and considering the humor of the game probably pokes fun at the whole kickstarter idea.)
*Design/Voice an NPC (if you need any terrible Australian accents I will literally pay you for the privilege haha, actually serious I would love this to be an actual tier... and not too much out of my budget hopefully [couple hundred? or less of course if you're nice])
- Physical Artbook & Soundtrack (I don't "personally" need a physical edition of the game proper, a lot will disagree, but these two in particular I would love to have [even if its just as a tier reward])
*Other cool stuff!