difference between IS 8.2 and 9.0 versions

what is the difference between webMethods integration server 8.2 and 9.0 versions in terms of IS, designer and any other important changes.
please help with understanding the transformation.

The best way is to read the ReleaseNote after version 8.2 to 9.0.
Because there are many changes, and no one understands better than you that which part is important to you.


if considering a migration:
what is your current version and what will be your target version.

Please note that all versions prior to wM 9.5 SP1 are out of support now (EOL) and most versions prior to 9.8 only have support thru extended maintenance agreements if the affected customers have purchased one.