-Destiny is rated T and not hardcore. What about it makes it hardcore? Not all shooters are hardcore...
-The game itself does not have to be huge. If they are doing a remaster of portal 2, then that can still be considered their biggest project seeing as how it's better than a simple port (mass effect 3 and deus ex)
-Once again, there is nothing stopping the game from being canceled. This may be hard for you to hear, but it is very much a possibility given (a) wii u's install base (b) wii u's audience ( c ) internal development issues
and yes, TP is a possibility, albeit not a very strong one given that we already had a wind waker, ocarina of time, and majora's mask remake this gen.
-Almost every FPS is hardcore, and Destiny is definitely mature/hardcore with all that violence.
-Maybe, but I cant see why would somone want to port Portal 2 on Wii U, I dont see at all Portal 2 is that game, much bigger chances are for Minecraft than Portal 2.
-Why would be hard for me to hear that!? I all know all that. Again, I think too many time and resources were spent on this project to completely cancel, maybe it's moved to NX (like probably Project Cars) but I don't think is completely canceled.
3DS had two Zelda remakes, Wii U one, but huge dirence is that you can already play TP Wii on Wii U. I am not sure about this TP HD thing, but with this rumors I say chances are around 50%, but TP HD does fits pretty good with infos we have about Tantalus project so it's definitely possibility.
-Not every fps is hardcore. In fact, calling destiny hardcore only reinforces the silly belief that children who play games like destiny and halo are "hardcore gamers." Destiny was rated T for a reason (to appeal to more that just the mature crowd), so it is very much a possibility given that that Tantalus only ruled out rated M games.
-Minecraft is also a huge possibility, but that doesn't deter from the fact that portal 2 is a possibility. Why would Portal 2 be a good game for the wii u? Because before splatoon, it's the only fps were the goal wasn't to kill and is very highly rated by most reviewers (still rated better than splatoon). That seems like a great fit for the wii u audience while adding another great 3rd party game.
-One thing you repeat is that too much time and resources have been spent on the game. But given what we were shown, there is no indication of progress being made on the game (nor gameplay, nor trailer, nor screenshot, nor name). Sometimes it's better to cut losses than to continue. The fact that they have said absolutely nothing about their game tells me that this thing got heavy delayed possibly cancelled. Likewise, no mention of it was made in E3. Remember, the video that was supposed to highlight upcoming 2015-2016 games. If progress was made, then they would have shown it to not make their third party presence a skylanders amiibo thing.
-finally, looking back at info they did give. They mentioned that the game was a AAA xbox/ps port, and that they other part of their work was an xbox/ps port of a wii u game. So despite the very little info they gave us, TP does not fit