Essentially, the change allocates 5 of the 100 texture slots to be full floating point textures. Generally the data set there will be linear (and Brecht changed the monikers for those to be "color" vs. "non-color" instead of linear vs sRGB). Any source texture that is naturally a float format, such as EXR or 32-bit float TIFF, or HDR, will automatically get one of those slots.
A couple of things to keep in mind:
- You've only got 5 full-float texture slots, so be judicious in your use of them. Any textures you don't want using the those slots need to be saved in a format that is not floating point on disk, and they will land in the regular texture slots instead.
- Anyone who was using the 100 slots before for non-float textures, though, is in for a surprise; they've lost 5 regular (non-float) texture slots. Never fear, all you have to do is change some textures to a float format (such as EXR) and you'll get back to the 100 total slots that way.