Hide SMS message in notification bar
GoSMS Pro has a "Notification bar privacy mode" option, which 'shows "New Message" instead of the message's content'. 



I personally use Sliding SMS (which is a standalone app created for and taken from CyanogenMod 10). It has an option to enable "Privacy Mode", which hides the sender and message from the status bar notification. 8sms (which is also from CM10 M2) also has this option.