CSS Form Builder 2 replaces CSS Form Builder 1.
Security Assist 2 replaces Security Assist 1
As listed above, HTML Editor 2 is included in CSS Form Builder 2.
HTML Editor 2 replaces iRite
"Am I right in assuming CSS Form Builder replaces Universal Emailer 4 and HTML Editor 2"
Yes, as listed above, UE4 and HTMLEditor 2 are included in CSS Form Builder 2