Well no one here knows, and we dont even know for sure we are getting a faction and none of the devs will tell you (at least for another 7 days until we know for sure or not) but considering the romulans only have like 4 canon ships, i think its a safe bet it will eventually turn up.
thalaron weapon? who knows. if they make a c-store version then it seems a natural choice.
As nice as it would be to have a 3rd faction added to the game, I get a very bad feeling that the community desire to have a 3rd faction is rushing way past what the most likely outcome of not having a 3rd faction and instead having some sorta store line mission addition and weapons, equipment, console, Boff ,Doff content addition instead.
As far as a playable scimitar? Or any playable romulan ships at all for that matter... Well they are releasing Jem'Hadar, Breen, Mirror Uny, Tholian, Ferangi and Cardassian ships through lock boxes, lobi and Christmas events. It is more likely that romulan ships will be made available through those methods instead, with the likely hood that the scimitar will be a carrier. If you have watched Nemesis, especial Data and Picards escape, you would know why I assume they would make the scimitar a carrier, and not a lancer/thaloron special.
But... yeah... that is the most likely out come, lockbox ships, lobi ships, additional missions, weapons, equipment, consoles.
With only 4 cannon ships, they would have to make up a bunch of romulan ships, as well as mix in other factional sources, just like they had to with the klingon playable faction, they had to add Nausican and Orian race ships.
Then the question comes up, what romulan perspective will we come from to begin with? we have 2 now! The refugees current mission are helping and sela vengance romulans...
This duality disparity would cause additional confusion as to being able to make a romulan 3rd playable faction. The refugees we are helping are more suitable in my opinion, if a 3rd faction was released, but then you would face a very problematic content limitation issue, cause the refugees don't have the military ties as the Tal'she'ar. So from a ready to place content view point, a tal'she'are at war with the klingons and feds, in legue with the hunters and some others would have more content to base a faction on, and it would be easier to apply PvP with them.
But still... it just seems so much more like it will simply be a mission and equipment release, and not the 3rd faction hopes everyone is looking for.
Have no fear guys. When there is a Romuan playable faction not only will the scimitar be available but you will have three, yes count em, three to choose from.
Why there will be your standard tactical version that comes with all the cone of radiation death that we all know and love! Or you can choose from the brand new science edition that comes with reverse engineered tractor probes that have been reverse engineered from Borg technology to help ensnare your foes. Last but not least we have the special limited edition engineering edition that comes with a convenient and easy to use hatchback for extra storage!
All these and yours can be had for the low low price of 25 dollars a ship or 50 dollars for all three. Why yes that is a total of 25 dollars of saving that we are passing on directly to you the customer.
So come on down to Crazy Taris's used ships where the deals are going supernova!