I like the new look a lot better than the old one.
Looks a lot classier.
I was never a fan of the particular colour green that Pentax used for many lens rings. Often it was combined with a red (e.g., for a "Limited" label) which clashed. Many lenses added more colours. The worst example I can think of is the DA* 55/1.4. It featured
- two hues of red (mount indicator and "SDM" label),
- two hues of green (lens ring and "AF" label),
- blue ("ft" scale), and
- worst of all: gold.

It looks like a fourteen year old wondered what other cool colour they could add (with complete disregard what is already there).
The new lens designs are excellent (not only in comparison).
However, I understand those who are hungry for more.
The K-30 -> K-50 upgrade and the new lens designs are more or less cosmetic upgrades that you would expect from an established player (i.e., Canikon). It would seem that Pentax has catching up to do and hence people can be excused to expect more dramatic news.
I'm hopeful, though, that the next Pentax APS-C camera will be a cracker camera and will potentially stir up the competition as well.
P.S.: One should not expect a big impact of the rounded aperture blades on bokeh. Extreme bokeh highlights will look rounder, but the main bokeh characteristics (smooth vs nervous OOF areas) won't be affected.