See Table 1. Core media format and codec support:
In order to meet this Android multimedia framework requirement, most current ARM SoCs (as used in mobile devices) include hardware support for VP8:
It is not a case of "About to", for most makers of ARM SoCs it is more a case of "already do". Qualcomm, Apple and Sony are the holdouts.
No doubt all of those who already include VP8 support in hardware will be quick to include VP9 support as well in their newer ARM chips.