Clone campaigns, lists & newsletters with one click.
Set sending hours and days for campaigns.
Exclude lists from campaigns.
Campaign progress bar in your reports.
Subscriber tags provide another option for segmentation. They are accessible in triggers, advanced search, as campaign/autoresponder perma filters, when you import, when using the api and in your opt-in forms.
Campaign tags (same as the ones you already had in autoresponders) so you can better organize your campaigns.

Multiple bounce servers. Each smtp server may use its own bounce server.
Counter & daily quota for each SMTP server. Daily quota is reset with a cron job. For hourly quota you can use the existing throttling or antiflood options.
Default bounce server when using other sending methods (non-smtp).
Custom smtp headers also applied to trigger emails and other non-campaign emails.
Added subscribers automatic suppression (based on thresholds you define) also when processing bounces with Amazon, MailGun and SendGrid webhooks.

Fixed an issue with the zip template importer (when filename had two dots).
File managers check permissions and maximum file size allowed and alert you accordingly.
Change the way the "Read in browser" link is applied, made it easier to type the text you want.
Productivity enhancements when working with newsletters. Less page reloads.
See uploaded zip templates and create a newsletter with a click. You will find a folder with templates to get you started.

Quick search: besides subscribers, you can also search in your newsletters (subject/comments) and campaigns (name/comments).
Added Bcc-to-email at campaign and autoresponder.
Full list names appear in the "Share with 3rd party" report.
Improved ratios calculations.
Added list search option in the lists drop-down menu when viewing subscribers.
Renamed external post requests to outbound webhooks.
Added a chart to visualize and count the Opt-out reasons your subscribers choose.
Home page shows pending campaigns with a direct link to view.