Don't have any insight on the Felt, but it's not just Trek that has held off so far. Ignoring rumors of potential disc brake bikes you still have Canyon, Cube, and some smaller high end bikes like the TriRig omni and Premier Tactical. Given Cube's are impossible to get in the US and Canyon depends on stock and your size but you're not quite as limited as you infer.

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Benjamin Deal - Professional - Instagram - TriRig - Lodi Cyclery
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Quintana Roo PRSix

https://quintanarootri.com/...eries/products/prsix

I'm in the same boat as you with the FRD. I recall Jim Manton basically saying the IA is still at the tip of spear as far as aero...thus if there is a 'new' version might be front hydration like you mentioned, and/or tilt adjustment for the aero bars. The Px/P5 have it pretty nailed as far as disk brake bikes at this point. Tririg Omni would be the only thing I'd consider if I was going to stay with rim brakes.

Never thought I'd want disk brakes on my tri bike but after spending this spring with my Venge Pro they really got me considering it. Just so easy to mount and of course stopping power being precise.

I had the original IA FRD sold it last year got a new IA disc brake. Other than the looks the new one is completely different and way better. Gone is that Mickey Mouse seat clamp. The bento box is better. The front end is all new.... one piece nose cone, thru axles and way stronger. And boy does this baby stop. The bike goes down hills like it is on rails. Then there is the rear storage too. I have 5 full blown tri bikes my new Felt is going to Kona 2021.