Sadly, my prediction is... it's nowhere near on their radar, since Scenario wasn't hesitant to tease us with a name :P
But let's delve into it!
I guess potential Rhudaur would be roughly the size of the Yondershire? Which makes it suitable as a regular quest pack update? On the other hand...
In my
earlier suggested list of urgency I said this gap could bring us to Gabilshatur through the mountainous passes near Gram but if the new addition would be just Rhudaur, well, I guess the waiting could be long and there would be still such a glaring gap... So this makes me think perhaps this entire area is a great fit for next "mini expansion" whenever that may be (and the mini expansion thing seems to be more warmly received with lower lvl stuff such as CardoSwan - whereas with Three Peaks it was met with scorn, since it was cap and thus seemed more like a cash grab to many people). So maybe, hmm, maybe it's a good idea to focus these "mini expansions" on the gaps? Or needed lower lvl alternatives such as an alternative to Moria?
So, similar to Cardo-Swan, we could have Rhuda-Gram and that mini expansion could encompass Western stretch of Misties to connect with Trollshaws, Gram and Moors. Depending on how feasible it is and whether they can make a marketing buzz out of it, they can even move the PvMP Moors to another layer and have the pre-invasion open-world version of the Moors that is the proper intro to the actual PvMP storyline.
Maybe. (which would be an opportunity to give Moors a landscape refresh) But not necessarily, just surrounding Moors and maybe have a few portal entry ways would be just fine too! Either way, as a mini expansion (but still mountainous space so there wouldn't be as much of a wiggling room for content as there is in Cardo-Swan) the area would be just fine to accommodate 30 something to 45 alternate route to Gabilshatur and then 45-50 that acts either as alternative to Angmar and alternative follow-up from the Misties that can feed players to Angmar, and maybe it all culminates in some kind of modern Goblin Town 2.0 with Mount Gram?
(as alternate route, but the Epic does need to introduce the Golodir story and deal with Rammas Deluon, so trip to North Downs and proper Epic entry to Angmar necessary... if someone cares about exploring that entire storyline, but otherwise, if not, a player could choose, just like they gotta choose now between Breeland, Cardo-Swan, Northdowns, Lonelands etc)
Rhudaur is a funny one. It's the Trollshaws but it's also North of Lonelands (Amon Sul was contested territory between Kingdoms) and parts of Eastern Angmar, and its official territory extended as far as Car Bronach, because we have Arnorian stronghold there, plus we had Rhudaur barrows. Through Trollshaws and Lonelands (+ mentioned Rhudaur) are probably the core Arnorian territory, whereas everything else would be hill-men and wild men populated, for the most part, under Arnorian authority, and that's where the Witch-king got his claws first and made allies. But yeah, that's one of the reasons why it would be so cool to delve more into Rhudaur next! Also, the whole Lost Temple business made it even more confusing and intriguing...