AVCampos

Any BT controller that works with Android apps should work with BC2. Just to be sure, you can ask someone with a PS4 controller to lend it to you for a few minutes, and then try out BC2's controller test feature. But, if you intend to buy a controller specifically for BC2, it doesn't have to be an expensive PS4 gamepad: any generic one should do.

A cross between 42028-B and 42055-A? Yes, that could be interesting. But, please, with the hoops in a more common colour!

Bluetooth and glove usability aren't related. What you probably mean is on-screen controls vs. physical controls, and that can be remedied by BrickController 2 or Pybricks.

LEGO produced the PF E motor, and only found use for it in a single Education set.

Curiously, all Technic garbage trucks (8868-B, 8479-B, 42078-B) are of the "front-loading" (I don't know the technical designation) type. There's room for a "side-loading" or a "rear-loading" truck. Also, the garbage trucks in my area have an articulated crane to pick the bins and unloading them through the top of their container, and steering on the third axle. Many possibilities for mechanically interesting sets, then.

The functions I see for such a machine are articulated steering, piston engine, and pendular suspension. That could work for a set, but mid-size (comparable to 42049) at most.

If you're referring to another hauler, I highly doubt it: the 42114 is too recent for that.

This video shows it:

Depending on the price point, the alternating flapping wings could be enough functionality.

Is there a new RC-capable battery box?

The 9396 has optional motorisation.

I think that's entirely possible, although having a small wheel constantly dragging on the floor (especially when the vehicle turns) is an ugly, ugly solution. The spring-loaded mechanism would allow some ground clearance.

At least on Brickset's image I can't see any shock absorbers; but, given that the interior must be filled with the hub and motors, the sides are a logical place for the shocks.

Speaking of tangible information, is that the new "Lemon" colour on the ripsaw? The one that debuted in Monkie Kid sets?

Four-wheel steering? It's gradually becoming more common in real cars, and it's been a long time since the 8880.

Most likely, a spring-loaded bistable mechanism, a fancier version of what we have on light switches.

Hmm, a Rollcage-like car? That would be interesting and, with present-day huge LEGO tyres, quite doable.

Besides, TLG has been doing it for decades, and people are fine with it: what heavy machinery uses pneumatics instead of hydraulics? (except perhaps excavator-mounted jackhammers)

If LEGO launches a 1:8 supercar with remote control instead of a gearbox, people will complain that if they wanted a big RC car, they'd get a Tamiya or some such brand.

Most likely they're Gen3 pins, which were introduced this year.

Or an upscaled version of the 42090/42091 combo model...

Yes, and preferably in basic colours (grey, red, yellow, blue, black, etc.) before the more "exotic" ones (purple, azure, etc.).

Probably it went well with focus groups. But won't it be too big and heavy for any decent performance? Unless it uses two pullback motors.

Well, a carriage could at least be pulled by horses with mechanical linkages for legs, like the stuff by JK Brickworks. It'd be actually interesting and unusual for Technic.

The simple fact that you used transparent parts for the headlights already makes it better than the original.