Draenor: does any in-game text make the connection to Outland?

(Emphasis added.)

The most direct acknowledgments are from the quest Fugitive Dragon:

A bronze dragon freed Garrosh Hellscream and took him to this world. His name is Kairozdormu, and he's a fugitive from Azeroth. It's time to track him down.

His essence permeates this entire timeline. If I could just get a hold of him - dead or alive! - I could re-calibrate my magic to this era of Draenor.

and from Temporal Juxtaposition:

It would seem someone is attempting to affect a temporal shift by sending items back into this timeline from your own timeline.

Technically that shouldn't be possible. But whoever this is found a way.

Two quests reference Outland specifically: Settling Grievances

Hellmaw slew my brother in Outland... this is personal.

and Completionism

Interesting - the coins you've brought back from your Garrison are slightly different than the ones Nolan collected in Outland.

but neither of them specifically mention the timeline shifting.

Upon satisfying the requirements to build your shipyard, Khadgar gives a quest entitled The Final Assault; his dialogue for this quest includes the following lines:

Our campaign in Draenor has taken an unexpected turn. With Gul'dan assuming power over the Iron Horde, history is poised to repeat itself - our world is in more peril than ever.

Together with Khadgar's quote from Jeremy's answer on this question, it's clear that this is Draenor from a different era, and history is in danger of repeating, spelling out the fact that this is a version of Draenor's past, before it becomes Outland, as has been established in the lore of previous Warcraft games and The Burning Crusade.