You're leaving out one important fact, though: the matter of viability. Kennen is far more playable than Cassiopeia (infact he has seen plenty of play at Worlds) whereas Cassiopeia remains an unloved and underperforming champion in dire need of attention. By omitting her from your updates you're just supporting my belief that your company mainly cares about popular champions, everyone else simply doesn't warrant the effort anymore.
(I can't speak much to updates here since I'm on the skins team and I'm not currently in the know as to what's happening in gameplay/balance land. However, I would disagree with this statement. Cassiopeia has ~ a 42% win rate, and Kennen is around ~44%.
It isn't a matter of Riot caring about popular champions, but instead, working on creating awesome thematics that really work for a champion.
It's beyond me how you couldn't come up with a skin concept for her after all this time, it just doesn't make any sense. Have you even seen the wonderful ideas people post on here? Apparently they don't have a problem with creating skins for her, so why can't you?
We aren't putting her on the backburner in terms of skins. For example, we recently gave her a chroma pack. While it may not be a skin, it's still additional cosmetic content for this champion.
I have seen a lot of the awesome art, and I'm partial to one of the snow/ice thematics where her Twin Fangs are ice shards.
While it's easy to come up with a concept (especially when there isn't art and it's just words), it's much harder to create the model and particles that really sell that fantasy. For example, maybe a winter snake doesn't work well, but the particles do. That leaves us with something a bit more difficult to solve than anticipated, which could mean more time in development. Just using this as an example, but there are instances where we do create something and it doesn't work the first time around and we'll either shelve it, or in rare cases, trash the idea completely.
Just because you're so focused on releasing skins within a thematic series doesn't mean you can't release unique ones, you already did it for Kassadin and Brand this year. So when's finally Cassiopeia's turn?
I 100% agree with you here - we certainly don't limit ourselves to existing thematics and are open to creating new ones.
How much longer do I need to ask this until you do something? I'm counting every single month that passes and every single PBE update you put up and it merely strengthens my determination to keep up with this constant questioning. It's only going to get worse.
It's awesome that you're passionate about this. Unfortunately, I don't have the answers you're seeking. I'm not able to discuss what we may or may not have in development for Cassiopeia, but as I've mentioned in this thread, I don't want Cass players to feel like their comments are falling on deaf ears.