OptimumTech hit some good points about the vent pattern, and I'll admit those were concerns of mine during design.
Obround was put in for where people would potentially be mounting parts, going to remove the rear obround pattern and change the internal front pattern to rectangles. Should look better. I've only seen one person actually use the rear for a pump mount, and given everything else done to the case they would have had no problems drilling their own holes. See no reason to keep the rear obround pattern.
Bottom rectangle pattern was chosen for maximum airflow and minimal turbulent noise. No changes to this other than I might make the SM560 able to accept 140mm fans in the future.
Top round pattern was chosen due to handle, originally had a rectangle pattern similar the SM550. Working on a prototype that has a new rectangle pattern.
For the radiator compatibility, here's a big question for everyone:
Would anyone be interested in us providing an option to purchase an Asetek 280mm radiator (no RGB or anything fancy like LCD/software) with two Noctua NF-A14 PWM chromax.Black.swap fans as a kit at a discount when purchasing the case?
Price would be competitive with NZXT / Corsair / Coolermaster 280mm AIO offerings, around $140~$150, but again - no RGB and you get the worlds best fans.
Might also make this Noctua / Asetek radiator combo standard for our SM570 in 240mm, SV590 in 360mm, and start bundling a 92mm slim with our 92mm AIOs.