I know all receptacles in a garage require GFCI protection. But what about garage lights? I plan to hard-wire some new wiring to new garage lights and I'm wondering if this circuit needs to be on a GFCI breaker.
NEC 210.8.2 requires all outlets in a garage to be GFCI protected so if your lights are connected by an outlet they need GFCI protection if they are hard wired they do not require GFCI protection. Exhibit 210.10 provides a illustration of this.
Find out if your jurisdiction has adopted NEC 2014 yet. Many haven't, because the requirements for AFCI and GFCI are really, really over the top, especially since the requirements for $40 AFCI basically to cover lazy builders who insist on using backstabs. Pre-2014, garage lights whose receptacles are on the ceiling, and therefore are not readily accessible, do not require GFCI protection.
Most especially, lights should not share GFCI protection with common receptacles, because a tool tripping the GFCI will plunge you into the dark. Now you have a dreadful situation: you are blind, the saw blade is still turning with a lot of energy, and the SawStop's contact detection has lost power, so it will not stop the blade if you get your hand in it.
Here in Italy is mandatory for all (home and home-related) circuits to be RCD-protected.
That's because here we use TT distribution and short-circuit current usually isn't enough to trip the magnetic breaker (short circuit protection). Also because RCD let trough little lower current than MCB so there's big chance of not being killed in case of touch of an active conductor compared with MCB-only protection.
So my suggestion is to install it anyway.