This is the ASUS PadFone
engadget.com
engadget.com
I wouldn't really be interested in this tab/phone thing unless they worked a Transformer-style keyboard dock into the mix. After using the Transformer I've realized I want a netbook 80% of the time and tablet 20% of the time and I won't go back to using a pad/tablet device that isn't both (I know other tablets can be used with bluetooth and/or USB keyboards, but it just isn't the same as having it in an all-in-one device).
If they really want me to buy an ASUS phone too what they should do is have a variant of the Transformer which takes a docked phone into the keyboard dock while leaving the phone's display visible and usable. When the phone is docked into the keyboard dock, have it dedicate its display to being the laptop's multitouch touchpad.
Add in an API where apps could detect being in this docking mode and modify the phone's display based on context (somewhat like Windows SideShow, but as a multitouch input panel).
That would be a worthy followup for my Transformer and also convince me to buy an ASUS phone.
EDIT: Looks like ASUS are already at work on incorporating Tegra 3 into their designs: http://www.engadget.com/2011/05/04/asus-planning-quad-core-t...