@ Ehume, some motherboards do have voltage control ; a fan controller need not be PWM.
IMO If corsair can't get a tickless PWM fan then it's better off they not launch a PWM fan. No reputation for PWM fans is better than a bad one ; having to pay for RMAs from customers is a loss of profit. (Gentle Typhoons are not PWM.)
If we look at the market for 120mm framed 140mm fans, it's basically CPU heatsinks with 120mm mounts. I don't think many people will buy them as casefans.
The NF-A15’s frame features 120mm mounting holes (105mm spacing) and has been enlarged to 150mm width in order to provide superior performance on today’s high-end CPU coolers.
The market for 140mm fans is slimmer than 120mm fans since the number of cases with 140mm case fans is lower. So that leaves 280 radiators such as Corsair's H110 or NZXT's Kraken X60, not counting actual watercooling radiators.
I think Corsair's lack of top filters / side filters on their cases deserves looking at. Silverstone's filters aren't that awesome for the amount they charge, a Corsair equivalent to FF143 or FF123 would be great, but even more so if there was one for radiator or dual 120/140 setups ala the FF142 but with a frame not nearly as thick (5 mm is too much , ~1.5mm is better) and with reinforcement ribs not covering the fans' airflow
A fan splitter like Swiftech's or NZXT's GRID (but with PWM capability as needed) would be great.
That said, the rest of your post is spot on.
edit: Silentpcreview claims NF-A15 struts are different "We don't know the advantages of this semi-octagonal frame but the higher curvature of the struts should reduce tonality compared to the A14." http://www.silentpcreview.com/article1345-page3.htmlEdited by AlphaC - 8/16/13 at 10:29am