The 14-35mm f/4 L is the most interesting of yet-to-be-announced-and-released lenses from this roadmap for me.
I love UWA for landscape mainly, and so prefer each mm of (ultra) wide angle goodness over an extra stop of speed. 95% of the time at ~14mm/15mm I'm at f/8 - f/16 anyway. I also use UWA for some architecture, and occasionally creative photography (e.g. artistic subjects appearing disproportionately large in the foreground).
I understand that some people prefer the slightly smaller and lighter weight of a 24-70mm f/4 over a 24-105mm f/4, however there's not much in it, and the reviews of the RF 24-105mm f/4 are very positive.
(The 24-70 f/4 are around 600g on average, with the 24-105 f/4 @ ~700g).
Distortion is not that much different (2.4% vs 3.3% on average) - which can be (batch-auto)corrected in post.
The f/2.8 24-70mm lenses often have around 3% distortion anyway.
Each person's style of, and needs within photography is unique. I really miss the 71mm-105mm range when limited to a 70mm for a walk around.
My plan is have the 14-35mm f/4 L, 24-105mm f/4 L, and 100-500m f/4.5-7.1 as my 'trinity'.
I have a bunch of EF (and even some EF-S) glass that also goes well on the R5, e.g. 100mm f/2.8 macro L, EF 50mm, etc.
It's a great time to be a photographer, we have so much choice (just maybe not so much in our bank account to be everything straight away!)
Regards
PJ