It's there:

http://www.sternpinball.com/community/stern-of-the-union-address-february-2018

Union always mentions surprise releases, so any title is always a candidate!

More new resources could/should mean the already present resources get less new work assigned and have more time available in the future to finish their earlier projects.
But the decision to assign the resources to new titles to be released or to finish the already released ones is up to Stern of course.

Actually I like my Sterns a lot.

When I'm looking to buy a game I pay attention to:
theme and licensing (fe custom voice work of involved people, artwork,music ..)
layout
rules and scoring
fun vs risk factor
spare parts availability in the future (a company that sells a lot of units is almost equal to parts availability)

JJP is well designed, beautiful, toys... but to me the fun and wow factor is completely missing..
WOZ: ok game
Hobbit: played it a lot of times but I just get bored with it, even in the middle of a multiball..
Dialed in: certainly the better one to me but certainly not something I would buy due to the theme
POTC: really great effort but they missed out completely on the license part

Problem with GB is currently:

- score balancing
- and a wizard mode like are you a god is simply needed No matter if it's on the card or not.

There is nothing that ties the game together regarding an overlapping strategy.

You catch ghosts for mass hysteria, you play the modes for the modes wizard mode.
Here and there you qualify for one more superjackpots.

But what about the dog or gozer hurryups, what about gears, what about a multiball superjackpot, scoleris being worth it beside a low super jackpot? To reach the 'end' of the game, you can ignore all this.
Those things should be needed in order to qualify to the big wizard mode. Complete modes, x superjackpots, x gears, x pke level value, x ghosts, x hurry up values, x slimed shots, etc.... get all this and you play are you a god. Heck even a big points award for "are you a god" or a small speed run (like destroy the ring) or ...

I think with little work you can make this game perfect.

Not actually true... in acdc you make shots to qualify multiballs

for jam you need (both) ramps
for tour you need (both) loops
for album you need target banks

these shots also advance your jukebox, path to encore, so you build it together

Except for some unbalanced points, mostly too low, there is no real reason for me in GB to shoot the hurryups for gozer, terror dog or gears.