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Cefiar
If you're not actually looking at the KiCad project and basing all your comments on the old board, then please actually download a copy of KiCad (you need Git 4022 or later) and have a look.
My comments are mostly based on general design, and not anything specific to the current in-progress or previous version(s) of the board layout. I've been working with mixed-signal design for about 25 years, and my gut feel is you don't need series damping resistors on the signal lines for this design. I'd still keep the FET gate resistors and try to limit the FET turn-off time to the uS scale, but those are totally different issues. As long as you're not seeing multiple transitions on the output of the '244/'125 drivers due to ground bounce or similar transient effects, I wouldn't worry about series termination.
I do have KiCAD available and intend to port the RAMPS-FD to a BeagleBone Cape when the design stabilizes a bit, so just holler if you want a review of the layout/routing. As I said before, the main thing is to keep the current loops small, especially the high-current loops with the heater FETs.