Well, there's no guarantee the boss fights will all be guardians. Especially considering Steppe Talus exists. And, IMO, the same enemy used for every sinngle boss would get boring quick.
If you look at the trailer, it shows two giant guardians(the AT-AT looking one, the flaming paw one, and possibly another, but I don't remember). They are giant guardians, but in this case, it just means that it's a robot similar to the basic octopi guardians, it doesn't mean that they are actually giant octopi guardians. I didn't actually say that all the boss fights would be giant guardians, anyway.
But considering there appears to be four giant guardians, at least,
On the switch trailer, you can see one giant guardian at 2:24, and one at 2:30.
I had a shower thought the other day and simply forgot to post it. Has anybody seen evidence of a traditional Zelda temple? Yeah, we have the shrines, but those seem to be more like mini temples. Have they decided to go the route of having several smaller dungeons instead of a handful of larger ones?
They have specifically said in some of the Nintendo Treehouse videos, that although there are over 100 shrines, there are still regular dungeons. I assume they haven't shown any to avoid spoiling the dungeons. Whether or not some of them are temples is remained to be seen.
There very well may be a video showing a temple dungeon, but if there is, I haven't seen it.
basing on the size of the 4 main guardians in the game it seems they themselves are dungeons, maybe there will be some static dungeons in the map but the 4 most important must be the four animals alltogether. it seems link not only has to climb them but in order to stop them it must get inside of their machinery.
Yeah, The giant guardians may well be dungeons, although considering that one is right near death mountain, I think that would be a wasted opportunity in not killing it through either throwing it in the volcano, or causing rockslides on it.