Well, that's it, I asked the IA "There will be possibilities for Frontier developers to incorporate atmospheric worlds into Elite Dangerous" and this was the answer I received...
In short, atmospheric worlds have been added, but only with very thin atmospheres (≈0.1 atm), like those introduced with the Odyssey expansion.
. These atmospheres produce visual effects (blue or tinted skies), but do not affect flight physics or include phenomena such as rain, storms, or real-world aerodynamics.
The community is deeply divided on whether Frontier could implement dense atmospheres in the current engine. Some comment:
“Dense atmospheres would require entire new flight models… a massive upgrade… So no. Not till the next expansion.” PC Gamer+12Reddit+12Wiki Elite Dangerous+12
“Landing on a planet with an actual atmosphere would require them to rework large parts of the game engine. That feature probably won't happen unless we get ED2.” PC Gamer+15Reddit+15Reddit+15
According to official sources and the Frontier forum, these densely atmospheric worlds are still on the roadmap, but in the distant future, with no defined timeframe on Reddit. Since 2017, David Braben and other developers have admitted to working on it, although they warn that it's a complex task and won't be coming "anytime soon." Wiki Elite Dangerous+2Frontier Forums+2Elite: Odyssey+2.
Future Outlook
Current Engine: Will remain with thin atmospheres and gradual improvements. Substantial advancements (meteorology, atmospheric flight, life, aerodynamics) require a major overhaul of the engine.
Next major expansion or Elite 2: It is much more likely to bring dense atmospheres, realistic atmospheric flight, and rich environments, along with new physics systems and adapted gameplay content
In conclusion
Possible? Yes, it's technically feasible. Stellar Forge already supports atmospheres.
Probably in the current Elite Dangerous? Very little. Not expected in the next few years.
Where could it come from? The logical thing to see is a new engine, a major expansion, or Elite 2.
Given the answer, let everyone judge for themselves.