Class updates to 5E SRD - what to expect?

Maybe someone have some ideas on when/if the SRD will be updated at some point with balance changes made since initial release. For example Wizards new iteration of the Ranger: <a href="http://dnd.wizards.com/articles/features/unearthed" rel="nofollow">http://dnd.wizards.com/articles/features/unearthed</a>... Historically is this something that happens or not? Have they announced anything about it?

The 5th Edition SRD Compendium can only contain information (such as race and class options, feats, spells, treasure, monsters, etc.) that is located within WoTC's Systems Reference Document . If WoTC expands their Systems Reference Document, you can count on that being added to the Compendium.