Considering Nintendo didn't outline a delay for Animal Crossing in their financials this quarter, it seems pretty likely to me that E3 is going to have a solid focus on it. They might even theme their booth around it this year. I suppose we'll see in the coming weeks when Nintendo starts preparing their booth.
Still, there's a lot of other games coming out in the second half of the year that we're going to definitely hear more about (Pokemon being the big one), but since TPC usually handles that I doubt we'll see much more than a few new Pokemon announced and a few live demos at Treehouse. I wouldn't get my hopes up for a big blowout on it, it doesn't really have a precedent.
Nintendo is just in a position to deliver a really solid conference without really doing much other than updating people on games that launch this year. No need for a bunch of flashy big new game announcements, they've left the second half of 2019 without a lot of updates for this.
