my guess is that the sporepedia we are seeing now is a very simplistic version of what it'll become eventually...
this won't come automatically though... i think it will involve the Spore team realizing that the current format of the sporepedia doesn't give much room and flexibility for browsing through millions and millions of creatures... i mean... there's over a million creatures uploaded already, and if you create one, it'll just get lost in the rushing torrent of creatures that get added all the time... it's like YouTube, where hundreds of videos are being uploaded at the same time... the YouTube guys did a LOT of work with their browsing and searching systems so you can find what you're looking for... i think in time, the Sporepedia will do just that
i hope at least... the current design of the sporepedia is way too simplistic to accomodate such large amounts of creatures
BTW, they've yet to add a sporepedia database for vehicles, houses, UFO's and whatnot when the full game is out.. so they better come through on this
Cheers