Well, it's not Double Dragon: Neon, but the Double Dragon 2 remake apparently still exists. We really haven't heard anything about the remake since it was announced two years back, and Korean studio Barunson Interactive has been silent. A recent leak suggests, however, that the game is still happening.
The leak are actually Achievements from Double Dragon 2: Wander of the Dragons, and implies that the game may be pretty close to release. Most Achievement leaks occur when a game is almost out, after all.
When it was announced in 2011, Wander of the Dragons was priced at 1200 Microsoft Points. Given how much time has passed already, however, that may no longer be the case. I wouldn't be surprised if the price tag's been lowered, honestly.
It's good news for those of us craving some old school bromancing, at any rate.