Nah. They're just making a mobile port of KotOR II and felt, "Why not?" I doubt it has anything more to it. Only EA can make Star Wars games at the moment, and they won't overwrite their MMO for Obsidian.
Disney has the rights too, they have mobile games made. Disney probably has the ability to make a remaster as part of the contract or they could have talked with EA and learned that they were planning on doing a KotOR-like successor and decided to do the update to hype it up. True they won't want to overwrite TOR, but they might not see it as doing that. They might see it as hyping things up for the new TOR Expansion or Disney could simply be looking to cash in on a remake or mobile port like you said. The might not be touch the original KotOR because Bioware/EA might have plans or want to do something with it in the future.
We know that TOR isn't going anywhere for quite a while as that was likely a large reason as to why EA bought the 10 year exclusivity rights -it was only running for a year when Disney bought Lucasfilm and they didn't really have time to profit from the costs to make the thing- but they could be planning on shutting it down for when they near the end of their exclusivity agreement.
Who knows? I'm holding out hope because while KotOR 3 can't happen, I've been hoping for a singleplayer successor for a very very long time.