The differences between SOAP1.1 and SOAP1.2

I see 3 differences: 

SOAP 1.2 uses "application/soap+xml" as Content-Type and SOAP 1.1 uses "text/xml". 
SOAP 1.2 does not use SOAPAction header line. 
SOAP 1.2 uses "http://www.w3.org/2003/05/soap-envelope" as the envolope namespace and SOAP 1.1 uses "http://schemas.xmlsoap.org/soap/envelope/" 

SOAP 1.1 request: 

POST /WSShakespeare.asmx HTTP/1.1 

Host: www.xml me.com
Content-Type: text/xml; charset=utf-8 
Content-Length: length 
SOAPAction: "http://xmlme.com/WebServices/GetSpeech" 

<?xml version="1.0" encoding="utf-8"?> 
<soap:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
  xmlns:xsd="http://www.w3.org/2001/XMLSchema" 
  xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/"> 
  <soap:Body> 
    <GetSpeech xmlns="http://xmlme.com/WebServices"> 
      <Request>string</Request> 
    </GetSpeech> 
  </soap:Body> 
</soap:Envelope> 

SOAP 1.2 request: 

POST /WSShakespeare.asmx HTTP/1.1 
Host: www.xmlme.com 
Content-Type: application/soap+xml; charset=utf-8 
Content-Length: length 

<?xml version="1.0" encoding="utf-8"?> 
<soap12:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
  xmlns:xsd="http://www.w3.org/2001/XMLSchema" 
  xmlns:soap12="http://www.w3.org/2003/05/soap-envelope"> 
  <soap12:Body> 
    <GetSpeech xmlns="http://xmlme.com/WebServices"> 
      <Request>string</Request> 
    </GetSpeech> 
  </soap12:Body> 

</soap12:Envelope>