It is quite common for footage of a work in progress stating such at the beginning. That's not just NT doing so, alot of companies have done so. Why do you feel the need to complain about that? It's not really anything new or NT exclusive, it's not like it hasn't been seen before, and it is such a small, unnecessary thing to get worked up about.
The gameplay, compared to past DMC games, doesn't look slower to me. Let's try and compare, shall we?
I think it looks fairly equal, actually. But I guess that is up to the eye of the beholder.
It's okay, though. You don't like this, and it is alright. You feel hurt, disrespected, betrayed,, angered, because Capcom has made this choice and made these changes along with Ninja Theory. I can understand that. But there's no reason to be petty about it. You're a grown, intelligent woman, you will live past this. If this is not what you want, then there is nothing forcing you to get it. Just let it go. Move on. Find something that you do like and care about that, instead of letting all the negativity, the hatred, the disappoinment eat you up from inside. You're stronger than this. Show it.