So it has been warmer out so I brought 20 or so small fig trees outside the other day. All different varieties rooted within the last 3 months and potted up over a month ago. All had 3-4 leaves, medium sized, darker green.

I brought them out Monday and noticed something weird on Wednesday afternoon. 2 or 3 leaves on 4 plants turned white, like someone spray painted them.

Does this mean it is still too cool in the evenings to bring them out or are they cooking in the sunlight?

If not put in (at least semi) shade; most likely it is (UV) sunburn...
Silvery white?

Too much sun for too long and too fast. Good chance they will completely defoliate.  Move to filtered sunlight for a while.

Thank you for the direction folks. I'll move them all into a more shaded spot.

Just snapped a picture. Here is what they look like. That's a JH Adriatic on the left and VDB onthe right. On the VBD that isn't reflection, it's actually that white.

Should I pull off the affected leaves or just let them be?

Yes that is sunburn.  Assuming all those leaves will drop, is it better to just leave them in full sun at this point so that the new leaves will acclimate to full sun right away?  Or would that risk further damage?

Yes leave the leaves. You can see the leaf veins are still healthy so the parts of the leaves that are not damaged will still produce energy for the plants. The cuttings have energy invested and it is best to let them get some back out. New leaves that emerge outside and receive some direct sun will be able to adapt to full sun much easier. Chances are that the plant will not grow much for awhile though because it has been shocked.

Leaf scorch, discussed here, with additional pictures:
http://figs4funforum.websitetoolbox.com/post/This-is-what-quotleaf-scorchquot-looks-like-5304488

This is what happens when you don't harden off your plants or slowly acclimate them to full sunlight, which is something discussed periodically here at the forum when talking about rooting.

Leave the leaves on. Plant will drop what it can't handle, and keep what is useable. Full sunlight is very hot and bright. Plants need to transition even if they come from bright interior location, even with gro-lights, etc. Sunlight is very powerful, and takes some getting used to when you are a tender, pampered plant, Coming from a high humidity environment to a low humidity environment also takes some adjustment.

Think about how you transition to sunlight, and begin your tan when you have been indoors all winter and become pale. If you jump to 8 hours on the beach, you turn lobster red. Leaves bleach and turn white.

I placed my scorched trees in filtered shade for a few months and jsut brought them back into the sun a few days ago, the leaves all popped right out.

Attached are pics of the 1 year old treed I have and some of the cuttings that rooted over the past few months all happily potted up and enjoying the sun.

Don't be in too big  a hurry.  The idea is to introduce them to full sunlight gradually.   Shade cloth when you reintroduce them to the outside is still a good idea.  After several days under shadecloth, begin removing it in the mornings and see how they do.  Then for longer periods.

You don't want a repeat of the last performance.

Interesting. I have never had a plant do that. Hmmm. Hey, don't know if anyone has suggested it, but after you defolate (deliberately) a ficus benjimina, you can cover it with a clear plastic bag, or inverted bucket for about a week or two and it will put out new buds again. Might be worth a try.

Yep, that's what I had John, just smaller. A few months in rehab fixed them up well.

Dave I hear you loud and clear. I moved them from a shady, the semi shade, to sunny, to driveway sunny over the course of a month. Everything looks nice and green.

Donald should I make this error again I'll try the inverted bucket method. I have a bunch of buckets I am earmarking for self watering containers.