Honestly the only DLC I'd be looking forward to would be a map expansion. There is a train track and bridge leading out West from Fort Callahan, and on the map it looks like a few buildings and roads are already there, just not fully textured. New cars are a bit meh for a game like NFS, when fully tuned they all tend to drive same-ish anyway. Also unless it's a new meta, most people won't even touch them so what's the point? It'll just add 1 hour of gameplay max, whereas new map or actual new features (cops & robbers anyone?) would add loads more gameplay hours.
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Addendum to my previous post on rep farming, I have a correction to make. It seems that rep from races and activities both do get multiplied live, but for some reason races do not increase your heat level as much as activities EXCEPT your first race of the night always gets you up to Heat 3 (assuming it's a 30k rep race at least). So if you do jumps, you only need ~200k rep to reach heat 5, but with races only you need closer to 1 million rep. The race MUST be the first thing you do. If you do jumps or other activities, the first race you do after doesn't get to Heat 3 anymore.
As a result of this, the fastest way I find to farm rep is to do one race --> laps of speedway with jump/speedtrap to reach heat 5 --> then do as much races as you're comfortable. My personal route at the moment is Maori Venture (58k rep and you finish close to the speedway) > speedway speedtrap > Flying Dutchman (just outside speedway) > Discovery A/B/C (individual races, not the full loop) > usually I escape after this because the risk of getting busted is too much (if you're better at evading cops, you might continue). Easy 1 million+ rep in under 20 mins, consistently every time. If you end up close to a high heat race and it's a 60k+ one, then do that. But obviously the spawn point is random. Also try not to do circuit races because it will concentrate cops in the area. With sprint races, even at heat 5 you'll be gone before the cops can bring reinforcements so you're relatively safe (unless you have the dreaded heli tailing you).
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In terms of money farming, if you haven't posted fast times in time trial do the trick I posted in previous page (no, it hasn't been patched as I was led to believe). Ideally you have someone really fast on your leaderboard so the ghost can show you the correct lines and "extend" your grinding session. You can cut across the barriers as you don't need to stay within their bounds, just need to hit all the checkpoints in the correct order. Unfortunately I maxxed out this avenue quickly as I didn't know about the trick and all my times are already very fast for me to beat
Very annoying, IMO they should still give some credits for completing the trial, even if you don't beat your previous time.
The speedway oval race remains the best at 52k per 1.5 mins. Just make sure you go back to garage after every TWO races so the reward doesn't decrease too much (via option screen is quicker than driving back). It goes down to 75% of what it was before so it's not worth the time saved of not going back to garage after two races (yes, I'm a total nerd and I made a graph in excel comparing credits vs time for all the scenarios
).
I also calculated all cars cost 24,262,000 Cr (excluding the FXXK since I haven't unlocked it yet). You can do the maths how long it will take to grind for them all