In the new DFA versions, large focus ring and QSF are good features, and they may also have improved the focus clamp. They might have recognised that these lenses in particular could be made a lot lighter and smaller.
Pentax is probably devoting a fair few design resources into coming up with new cheapie zooms (consumers are crying out for a 50-200mm).
Keep crying out for a nice fast normal lens - they might get to catering for the serious shooters one day, but remember pentax has limited resources and the market drives this biz.
I realise I'm being a bit of a dick, but in all seriousness, they have only improved great lenses. I've gotta say I'm feeling very tempted by these offerings.
David

