Just as I feared, and expected. The only hope is that you have unlock more DK stages, which in turn will unlock more DK music then the two shown but I'm not counting on it.
To be fair, I had suspected that DK was only going to get one stage on the 3DS far before the leak. Them advertising Past Melee stages as new for DK and Metroid immediately gave me red flags about the stage selection in this game.
There were three Rocket Barrel themes in DKCR: Mine Menace, Gear Getaway, and Hot Rocket.
If Gear Getaway is the name of the Rocket Barrel theme from the direct, then they are technically wrong, as Mine Menace should be the name since it's the full extended version of the Rocket Barrel theme (the one heard in the direct and the tournament), and not the shortened versions (which are Gear Getaway and Hot Rocket).
Unless, of course, there is actually a Gear Getaway stage which would justify the song name change.