Frontier today responded to a thread on the official forum regarding any announcement of what Frontier will be revealing at the upcoming Gamescom event. It should be noted this is not a comment on whether any DLC will or will not appear before the end of 2018, just that this will not be discussed at Gamescom 2018. That content, as Ed says below and in another post, will be revealed at some point in the future.
“Hope you’re all well… genuinely excites me to still see so much enthusiasm for Elite, because believe me, it’s an enthusiasm we share in the office (I’d argue our enthusiasm exceeds yours even… but this isn’t a competition so I’ll stop trying to win it).
“Just wanted to set the correct expectations about what we’re doing at Gamescom. As with previous Gamescom Frontier Meet events, we’ve focused on what’s coming in the short term with our game releases, we’ve had giveaways, food and drink, and created a space where you can interact with the developers and meet each other (in some cases for the first time in real life!).
“This year will fit the same mould, with us detailing what’s still to come as part of Beyond.
“As David was quoted in this post, we are still working on Elite Dangerous, and we’ll let you know when we’re ready to share our plans post-Beyond.