In relation to the idea that they were doing 4 retro liveries. I would guess that this stemmed from a pic that was first posted about 4 years ago which showed 4 A320s different liveries. I have seen this referenced as 'the plan' However image was merely a doodle by a guy on the modified airliners forum. I even saw it featured in a youtube clip as what was in store.
As of 10 months ago EI were looking at 1-2 A320 and possibility a repaint of an A330 during winter MX. Sadly this was reduced to only 1 A320.
Spotted this on another forum-
Video now on youtube of the delivery of EI-DVM in the retro livery: