I know a lot of people complain when more cats are added, but I think the saber cats are still the best looking models in the game, so I would love to see some more color options added. The one thing I would like to see is a bit of a graphic touch-up on them though, adding more obvious musculature like Sambas and the correct number of toes

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I know there has been a lot of people saying that they don't want old classic pets, like my beloved Irusan (Humar), getting updated graphics. I could not disagree with this more. Nostalgia is one thing, but Irusan almost never leaves my stable because he looks so painfully outdated next to Sambas or even the saber cats. The old world lions don't have to be Sambas recolors, but they should be touched up to a similar level of detail. Pets like Humar and Echeyakee should still have appeal beyond appealing to "Oh I'm better than you because I play with old model pets" elitists. I don't want to have to abandon Irusan because that there is some other black lion with better graphics. The old classics should get a new paint job so they can stay relevant.
Also, more spirit beasts are great, but please make them corporeal (solid)! As a saber cat lover I was happy to see both Ankha and Magria, but I think Magria should have been corporeal like Loque'nahak or Skoll while Ankha was incorporeal like Gondria, Ghostcrawler, etc.
In terms of new families, I would love to see Yetis come in as tenacity pets. The Northrend monstrosities are particularly gorgeous, and I would snap one of them up in a heartbeat. Thanks for listening, and all the requests you've already so kindly taken to heart!