I'm not saying the lens line up poor, there's problems in it but there's problems in everyones line up. I'm saying very little of note has been released in K-mount for almost 5 years now. In that time according to my possibly faulty memory; we've had one super zoom, a re-skin of a (very nice) macro, and 2 plastic consumer primes to show for this past 4.5 years.
Since the DA15 was released in late 2008, Nikon as an example has had 20+ lenses
24mm f/1.4
28mm f/1.8
35mm f/1.4
50mm f/1.8
85mm f/1.4
85mm f/1.8
200mm f/2
300mm f/2.8
70-200mm f/2.8 VRII
70-200mm f/4
10-24 (DX)
18-200 (DX)
18-300 (DX)
55-300 (DX)
16-35mm f/4
17-35mm f/2.8
18-35mm f/3.5-4.5
24-85mm f/3.5-4.5
24-120mm f/4
28-300mm
80-400mm f/3.5-5.6
200-400mm f/4
60mm f/2.8 micro
and a couple of tele converters, flashes etc ...
I'm not crying into my skinny latte about this, and I'm enjoying shooting with my 20 year old FA limiteds and my K-5 a lot, however the lack of momentum for k-mount looks very real to me.