They were posted by Morgan Roberts (lead level designer,he formed Trendy Entertainment with Jeremy Stieglitz in February 2010)
This is only my personal point of view - NOT A FACT
Now you see that second video has DirectX 11 in title.
That is because game was intended to be on XBLA, PSN & PC platforms, only after that accidental video leak of a mobile prototype build they took mobile version under consideration.
Quote - "However, we never intended to make this a mobile game, but the following press has us considering." That was posted 09-12-2011 on Epic Games forum, in original thread that was created 12-29-2010 by Morgan R. for job offerings for their "next killer game"
Some people here found it hard to believe that it looks and runs so good on iPad 2, this might be the reason why: "we're working with a highly custom, uber-powerful in-house version of UE3 that enables us to achieve a level of graphic fidelity heretofore unseen in a digital download product."
We didn't hear from TE in a long time but here is why I believe that this game is in heavy development: Trendy Entertainment, maker of the cross-platform Dungeon Defenders game, raises $18.2 million ,maybe even close to official announcement and release - 8-15-10 "I have been tasked with starting our next title. Although I cannot divulge any information directly related to the next game’s title, all I say is the art style is a complete 180 degree change in direction that Dungeon Defenders used. " That was 2+ years ago
I really hope they share some new info and that this game comes out for iOS/Android (:
Silly humans and your 4 dimensions. WE have 7...hundred thousandths!!! (: