The legacy API has a “property mode” to include history when fetching entities.
The new API does not have property history at all.
Whether the same endpoint or a new one doesn’t really matter, but it’s super useful to be able to fetch history.
The team is aware and will be adding this functionality. No timeline, but wanted to let you know something 
For those that end up looking for this - using the “propertiesWithHistory” parameter that is now available through the read endpoints of the v3 APIs will return the property history and source information.
Hi Niko! On behalf of the countless other devs who have probably landed on this page in search of the niche solution, only to quietly bounce and go about their lives shortly thereafter: THANK YOU!
In case this helps anyone else: include the name of the property (such as “address”) along with the “propertiesWithHistory” query parameter, like so:
{{baseURL}}/crm/v3/objects/contacts/:contactId?idProperty=email&properties=address,city,state,country,zip,email**&propertiesWithHistory=address**
We agree, @nikodev rocks! 
Great to hear man - I know the struggle. Made my day when I saw this - to the point I’ve remembered and come back ~2 weeks later to mention it.