Amen!! This drives me crazy. And it is so obvious they're full of it due to the vagueness of their claims: "Something big is coming to WDW soon! It may or may not come through, however." That one from awhile back was one of my favorites. Really, Captain Obvious? Anyone from the youngest WDW guest to a DTD pigeon could've made that prophecy.
Let me take a stab at being an insider just for once:
There is something big planned for DHS. It could be announced tomorrow, at the next D23 expo, or another unspecified time. This new attraction/land/show could be Pixar-related or not. I cannot say anything more right now, but there is something new coming at some point!
My advice: just enjoy the show. Let these "insiders" spill their completely vague, substanceless prophecies of what Disney has in store next. (It strokes their ego, gives them purpose, and is also funny as hell when Disney does announce something...but it's a complete opposite of what "their sources" told them.