You might see that API referred here and there to help with the new UAC scenarios. And you'll also read that some people are wondering where the API declaration is...

I understand that the COM team implemented Elevation Moniker to super-set this API functionality: The COM Elevation Moniker. From that page:

HRESULT CoCreateInstanceAsAdmin(HWND hwnd, REFCLSID rclsid, REFIID riid, void ** ppv) {
    BIND_OPTS3 bo;
    WCHAR  wszCLSID[50];
    WCHAR  wszMonikerName[300];

    StringFromGUID2(rclsid, wszCLSID, sizeof(wszCLSID)/sizeof(wszCLSID[0])); 
    HRESULT hr = StringCchPrintf(wszMonikerName, 
                                 sizeof(wszMonikerName)/sizeof(wszMonikerName[0]),
                                 L"Elevation:Administrator!new:%s",
                                 wszCLSID);
    if (FAILED(hr))
        return hr;
    memset(&bo, 0, sizeof(bo));
    bo.cbStruct = sizeof(bo);
    bo.hwnd = hwnd;
    bo.dwClassContext  = CLSCTX_LOCAL_SERVER;
    return CoGetObject(wszMonikerName, &bo, riid, ppv);
}

Auf wiedersehen!