A few hours ago, RickyG sent a message in the Discord server about reaching 30k members on the Gamejolt page. This message included a sneak peek of his next project. It seems to be a zoomed in image of the DF Connected logo, but there are some differences.

1. The purple soul in the O has been replaced with a red one.

2. The background is from the Ruins. Ricky hinted at this background having been used before, but we haven't figured out where.
UPDATE: Discarded Vessel has found out it's the background of the main DF Classic Multiplayer menu after beating the ending.

3. After overlaying the screenshot with the DF Connected logo, I found the second n in "Connected" had been removed.

Using that third hint, we found out that the letter that took its place is the letter L, since it's presumably the only letter in the logo's font to be far enough away to not fit in the screenshot.

We also found out the file name of the image is DFR, which is presumably the abbreviation of the game's title.

Using all this, I found the perfect word that might be the subtitle. It starts with an R, ends with "lected" and is even related to the words "Don't Forget".

Don't Forget: Recollected.

The definition of recollect is to recall a memory. If you recollect a memory, it means you Don't Forget it.

BUT HEY, THAT'S JUST A THEORY... A GAMEEEEEE THEORY!
Thanks for reading.

please ricky please say that i'm right