There is no indication of price or availability, so this "announcement" is almost comically vague, but it is interesting nonetheless. For the uninitiated, MHL is a standard that aims to simplify getting content from mobile devices (smartphones and tablets) while keeping the devices charged. The MHL folks were smart enough not to come up with their own unique connector/cable; instead it uses the HDMI or microHDMI connectors, and includes HDMI backwards compatibility. It looks like Onkyo's reciever will pop up windows showing you what content is available on the device, allowing you to easily push that content on to the TV. That doesn't seem like an earth-shattering innovation, but given the dearth of MHL-compliant televisions on the market - let alone installed in homes - it could be useful.
Of course, you'll need an MHL-capable phone as well. Here the news is good; there are only a handful of phones with MHL, but one of them is extremely popular, Samsung's Galaxy SII, and most of HTC's latest phones support it as well, including the EVO 3D at Sprint, Vivid at AT&T, Rezound at Verizon Wireless, and the Sensation at T-Mobile.