Also, the Federation does have working versions of Transwarp, so maybe the Titan has a slipstream drive?
I could see slipstream being silently introduced as the new normal warp drive in the same way that the warp scales silently switched between the TOS and TNG eras, possibly due to the technology that may or may not have been introduced with the Excelsior and called "transwarp" at the time because anything that makes a quantum leap in warp technology is trans-warp.
I personally don't like this very much. I'd like there to have been a recognizable thing that distinguishes a slipstream drive from an ordinary warp drive.
The first slipstream ship we saw chronologically was the fake Dauntless, and in Prodigy they've built a real Dauntless. Initially slipstream was represented by a blue tunnel effect during warp travel, and the fake Dauntless has a funky grilled slit for a navigational deflector. The later real Dauntless retains this shape for the deflector. That could be notable, considering that the fake Dauntless has no visible Bussard collectors, and these have been added to the Starfleet design, so if the deflector was just weird alien stuff Starfleet could have changed it.
I haven't played a meaningful amount of STO, but I'd thought that at the time they introduced slipstream as a ubiquitous state of the art drive, there was a loose convention of navigational deflectors that took the concave bit from the Voyager dish and turned it into a protrusive conical shape, sometimes attached to the rest of the hull on the top edge, so that the deflector's glowing bit became more band-like and there was a loose allusion to the cones of ramjet engines.
This is neither canon nor consistent to my understanding, just a shape the designers were playing around with for a while that marks a particular era of ship design. There's also plenty of ship stuff in STO that's definitely not canon because history didn't play out that way, like the collaborative Starfleet / Klingon / Romulan ship classes.
But by (I assume) coincidence, in the far future, the Discovery-A refit, which seemingly replaced the entirety of the warp drive while retaining the rough geometry of the ship for the sake of the spore drive, has thin blue bands for everything, and that means the Bussard collectors being a funky extension of what would otherwise be the warp coil glow, but it also includes the navigational deflector.
There is the ghost of a hint, through a mix of nudges seemingly deliberate and accidental, that thin blue band deflectors and slipstream are associated somehow. And the "ramjet cone" STO design cue is really appealing to me as a 25th C. design cue. I really-really want that to be a canon thing that slipstream capable ships integrate.
We haven't technically been told whether all these new ships are already using slipstream technology and still look mostly the same. It'd only take one offhand comment to do so and I won't be surprised if it happened. But the cone thing would be really, really cool....