From the note in the article I really think it shall not be an ally. But both the article and me have been wrong before. Still I guess it is an attachment with Mount trait.
Yes, that is my impression too.
It isn't very smart to introduce a whole new type of card, with another already announced (treasure) that hasn't even been published. It is too much to keep tracking and producing cards for every AP.
The 'three great' are enough already: Attachment/Event/Character.
Mesh attachment with character simply isn't a good idea.
Zwerg - a brilliant BGG user - recently created a LEGO model of Henneth Annun (hidden Outpost) and uploaded it to LEGO CUUSOO. Simply click on the link below the picture, register with CUUSOO (it's free of charge, and LEGO does not send spam). Then click on the green SUPPORT button.
Zwerg is the guy who made those nice reports with LEGO pieces.