Board Thread:Consensus Track/@comment-2200849-20150619130604/@comment-2200849-20150619201852

Sakaros, this new system would allow us to create new infoboxes with much less markup involved and also improve SEO and mobile access as Brandon stated. Look into the source of an infobox today: you will see nested wikitables, inline styles, parser functions and the like—while the new system uses a clearer, XML style syntax. Check w:Help:PortableInfoboxes for examples.

As for whether it's more of customization or creating new ones: it'd make creating new infoboxes a much less daunting task than before, yes. So creating a new infobox for Centurions will not require as much wikitext knowledge.