OfficerGeorge91

It may be like that, Though we'd probably have to add it to the singleplayer map still, that wouldn't be too hard probably.
 
Knowing Rockstar, they probably won't add any knew LEO vehicles of any kind but that is why we have mods. If any law enforcement does respond on the island it would probably be the vehicles already in game. I say that because Rockstar is known to be lazy with law enforcement vehicles, especially in V.
 
With a vanilla game, yes the backup would be off, you'd be stuck with LSSD, LSPD, SASP and FIB vehicles, unless of course you use the two old style vehicles. With addon vehicles, I'd guess about a week before we have skins for existing addon packs and that would satisfy most people in the community. For addon vehicles I'd say about a month and we'd have a pack out of the lore community fitting the location.
 
This is probably the hardest part to know until it happens, it will probably be multiplayer only but we may end up with it in singleplayer by default. I personally expect it to be exclusive to a mission in multiplayer such as a heist. I honestly expected a construction site to be finished or maybe a new casino but this is much more than that.

On top of Rockstar blocking all new content in singleplayer they are planning to the next games singleplayer and online separate games completely, that would make it difficult to port content over. That would cause the issue of callouts that use interiors needing even more work and it would also restrict the lore modding communities access to new models.

Until it comes out we can't say for sure but most likely no, it may even be locked to missions in multiplayer.
In the trailer there were some new vehicles shown, but no LEO vehicles, they seemed to be from a cartel of some sort. Seeing as it appears to be based on Colombia I wouldn't be surprised if that's what vehicle developers go to first

It probably won't take long to get it into singleplayer if Rockstar doesn't add it on their own but LSPDFR compatibility will be a bit more difficult that way. If Rockstar adds it I'd guess the LSPDFR dev team would give it compatibility and then UB and jurisdiction mods would follow. If its added in the form of a mod we may get UB and jurisdiction configs for it but that could take more time than LSPDFR and UB updates.