HT-IS100 HTIB is still too large for your hole in the wall, the HT-CT100 is probably your last hope at "surround sound." The sound bar itself is designed to be mounted beneath one's flat-panel and packs a trio of drivers which receive 50-watts each. As for the subbie, it gets a respectable 100-watts of its own. The system handles Dolby Digital / Dolby Pro Logic II / DTS signals and comes with three HDMI / optical digital audio jacks, a coaxial digital audio port, analog audio connectors and a remote to boot. Not a clue if this one's coming to America (though we have all ideas it will in time), but those in Tokyo can snag one in mid-July for ¥50,000 ($491).
Update: Seems this one's new for Japan only.