Sorry, just because something is "stated", like, "This game is going to be the best game ever made", doesn't necessarily make it so. How exactly is LSL going to be made less casual than the original? Is there a first-person shooter being integrated into it? 3D graphics? Will it require a dedicated controller?
Assuming all the answers to those questions are no, then this is a game that would easily fit on the Android/iOS platforms, where much more complex adventure games have already been ported (Secret of Monkey Island, Capcom's Phantom Detective, etc).
From the video I saw it looked like they were planning to make tablets a first class citizen with this game.
I can however see this going more for the nostalgia market than the "casual" market as such.
I can see that it would work well on a tablet but there may be other reasons to port to the PC first.
For example there the already existing codebase (although massively out of date).
Also their developers may be more familiar with programming for the PC, so it may just be quicker to bring to market on that platform. Also at the moment there are just more people that own PCs than there are who own iPads.
If there is sufficient interest/funding for this project I doubt that it will not be released for tablet devices at some stage.
Assuming all the answers to those questions are no, then this is a game that would easily fit on the Android/iOS platforms, where much more complex adventure games have already been ported (Secret of Monkey Island, Capcom's Phantom Detective, etc).