I think that bands/musical instruments + circus stuff like close up magic are going to be released in a Showtime EP. Also, i think that Vehicle Restoration will come when they release the Cars update. Nectar Making should come in a the Farming EP, while Canning should come in the Off The Grid Pack. Sewing and Knitting could come in a Fashion related career, but we already have that in GF (i think), then would be cool if it was introduced alongside Tabletop, Billiards, Poker/Gambling focused towards the Elders. They don't have much to do in this game!
The Hobbies EP should contain Sports related hobbies, a Jewelry, Glassblowing, Candle Making, Pottery, Metal Detecting, Bird Watching, Kite Flying, Scrap-booking, Origami, and Drawing, as well as other stuff.