Pentax today announced the smc PENTAX-DA 17-70mm f/4 AL [IF] SDM Lens.
The autofocus function of this lens is SDM only, so autofocus is compatible with the K20D, K200D, K100D Super and K10D (with Ver. 1.30 or later firmware installed) and later PENTAX DSLR camera bodies. When mounted on other camera bodies, the focus mode is automatically switched to manual.
Read the entire press release here: