As discussed at bug 50452 comment 9 it would be very useful for a page to have associated metadata about its title.
For most pages and by default* this would be identical to the all-lowercase rendering of its stored title, but where pages correctly start with a lowercase letter (on wikis where the first character is case insensitive), contain special characters or conflict with interwikis/namespaces, etc. the metadata would record the correct page title. It could also be used for titles that should be italicised.
e.g. on en.wp:
Page Title - Correct Title
[[IPad]] - iPad
[[Benzo(a)pyrene]] - Benzo[a]pyrene
[[Pilot No. 5]] - Pilot #5
[[D Ream]] - D:Ream
[[Computer]] - computer [indicating a common noun]
[[Amy Studt]] - Amy Studt [indicating the title is proper noun]
[[Animal Farm]] - <i>Animal Farm</i> [italicised proper noun, the tags are not literal]
The displayed title would be taken from this metadata and as such would effectively supercede the DISPLAYTITLE magic word and the [[template:correct title]] family of templates (and the equivalents on other wikis).
VisualEditor and any other tools that aid linking would be able to read the metadata and use it to determine what the default displayed name should be when linking to that article.
*Actually the default should be configurable as I guess languages like German that capitalise common nouns may want the default to be capitalised and the upper/lower case distinction probably doesn't make sense in all scripts.