Nope. It's the otto-pilot being disengaged. Heard it today on the 319. Same system tones as the RJ.
I sat in many (empty) RJs during FlyI's first few months and rode in the cockpit.
Also, since my j/s backed up to the cockpit and I would hear that chirp, I very soon after that asked what it was.

One FlyI flight sticks out...I was the f/a on a FlyI RJ, and while landing into IAD at about 6:30 a.m., I heard the sytem call out 'TRAFFIC...TRAFFIC', and we pulled up and to the left. At the same time, a helicopter buzzed us. Turns out it was the Fox5 news chopper off to cover the very important closure of RT28 due to a dump truck that spilled dirt on the freeway. If our captain hadn't turned as he had, Fox5 would have been making it's own news! (not that they don't already). The go around took another 1/2 hour to complete. Jerkz!!!