Nintendo released a Firmware update for all 2DS/3DS devices bringing the current firmware version up to 11.6.0-39U.
If you’re already modded with Luma3DS CFW installed then updating to 11.6 is safe in the sense it won’t brick your system, and the mod will still work. And for those of you who had your system hard-modded, fear not, you can always downgrade back to your original firmware (pre-mod) in the worst case scenario.
So while nothing will happen to your homebrew apps or CFW if you update, it’s too early to tell what Nintendo has changed and so updating isn’t really recommended just yet. The exploit used to hardmod the system is in the hardware, so Nintendo can’t patch it, but they can still do other nasty things..