Nothing until now.
I guess they're still busy preparing Puyo Puyo Tetris, Valkyria Revolution, & Sonic Mania.
But the
Miiverse is out... With all that lively fan arts...
So it's just a matter of time.
And also.. SEGA 3D Classic Collection's sales isn't that good.. (at least in Southern Asia & HK).
I won't be surprised if SEGA 3D Classic Collection 2 would be the last 3ds game they localized or produced.
Switch is more promising.