We are currently in the planning stages for the next large update of Email Marketing, version 4.2. This new update will include a number of important updates in regards to our email template system and the ability to add plug ins and custom coding into any of the admin pages.
Some of the items to be likely included in 4.2 are listed in our development tracker.
If you have any feature requests or issues you would like addressed please post them to the bug tracker or forum in the near future to have them considered for 4.2.
Due to the extensive scope of changes and additions we are not setting a date for this update at this time.