Off the top of my head, Jackpointers who need written up (because they get used a LOT or because they're interesting) still include:
Netcat
Pistons
Kat o' Nine Tales
Plan 9
Snopes
Glitch
Riser
Man of Many Names
Butch
Dr. Spin
2XL
Bull
Riser and Man Of Many Names were in 10 Jackpointers, not that it wouldn't be nice to see some stats on them as well as profiles.
I heard someone mention somewhere (can't recall now) that Netcat has a writeup in Corporate Intrigue. I've yet to get that one so I can't verify it.
Frosty/Jane Foster had a writeup in Artifacts Unbound, along with Jenna Ni'Fairra (AU is an awesome book full of crunchy goodness!) SeaTac Sweetie was in there too, near the beginning, IIRC.
Arete is one I've always been curious about and I don't think he's had writeups in anything as yet.
Others include: Beaker, Clockwork (because everyone wants to
Punch the Clock, Danger Sensei, Ethernaut...those are some specific ones I could mention, along with some others.
One thing I'd really like to see is a Street Legends-esque book full of antagonists. The Supplemental looks like its got some good ones in there, but what are the chances of seeing a book dedicated specifically to such folks? I know my preference would be a range of low-mid powered opponents/adversaries all the way to scary ones, like Alachia.