The Small Dream:
I would like to see a panel in the settings when working on email assets that would include an option for preview / pre-header text. Since preview text is now displayed in many email clients, I see it as being just as important as having a subject line. Please note that this preview text would be hidden, rather than visible at the top of the email.
An example from Apple Mail of subject line + preview text.
The Rough Idea:
Emails > Gear Icon > Settings
A mockup of what the setting panel could look like.
Currently one of the only ways to do this is to manually insert preview code after the <body> tag or include it into your header. Since preview text tends to change from email to email, it does not make sense having it be a header object. Having it hidden away in the code works but can be overlooked by others who are not familiar with it.
The Rough Example Code:
Your preview pane text goes here.
I look forward to possibly seeing this implemented in future Eloqua releases. Maybe it is already being considered?