I think the confusion might come from the fact that TOMI and the first Monkey Island special edition were announced at the same time, so it might have sounded like all the news was coming from the same company! The special edition games are definitely made by LucasArts though.
But it's true that the SOMI special edition will be available through Telltale's store. So they are a bit involved!
Good to hear you enjoyed Tales so much, and that you are loving Sam and Max so far! True, the graphics from the old games are quite dated now, though they were pretty incredible for their time. (I must admit I still like all those old pixelly games today, nowadays I consider them nostalgic!)
I'm not crazy; I'm sanely-challenged.