the interview is in french actually :
http://www.jeux-france.com/articles_dossiers243_resident-evil-ds.html

here's some quotes translated into English :

What do you think about the basic original Resident Evil game, it would
seem like it would be easier to recreate it with the PSP than to have
to worry about the different features of the Nintendo DS ?

Nakai : As creators we actually realized that it would be more
difficult to create a game based on the Nintendo DS requirements with
the microphone and the touch screen, but we thought that it could be an
original fun experience using those features with a Resident Evil game.
We wanted to do that. And then with the wireless side, we bring a whole
different style of Resident Evil that you haven't seen before, 70% of
the game is based on the single player side and 30% on the multiplayer
side, so multiplayer is still a big part of this game and we wanted to
try to create our own special unique Resident Evil experience with
that.

With these new features that the Nintendo DS has, why did you make the
act of decision to port an old classic rather to create something new
that could use these features from the ground up ?

Well the whole main concept of the game was to go back to Resident
Evil's roots, to the first one when all started because when you
think about it, the more sequels you put out, the more you start to get
away from the basic concept and the true meaning of what that game was,
so we wanted to go to the original Resident Evil game, and then on top
of that add different Nintendo DS features. We didn't know whether we
could or not, but that was the initial challenge we presented to
ourselves. And after a lot of hard research and studying, we were able
to do it.

Now that you have done all that, do you want to make an original game
from the ground up, not a port ?

I think that this is going to depend on the consumer interest level,
obviously if we try to sell this game and nobody wants buy it, then it
wouldn't make any sense to make a lot of time and money another
Resident Evil game for Nintendo DS. But hopefully, if the interest is
there, yes I could make a new episode.

Resident Evil Deadly Silence is a 3D game, was it difficult to make a
3D game for Nintendo DS ?

Well, the Nintendo DS is probably not suited for 3D, I think that
Nintendo DS is carrying over the Game Boy Advance technology by adding
some 3D support, the number of polygons that you can push on Nintendo
DS is around a thousand, if you add textures it's 800 polygons, so
it's not a lot. But still as you have seen there are a lot of 3D
games that are coming on Nintendo DS, it's going basically to come
down to what we can do with that power that is given. First we had a
lot of problems trying to make this game for the Nintendo DS, but after
we learnt to program it the right way, we were able to do it, it's
all possible.

Nakai also said that he has more Nintendo DS projects.

Resident Evil DS Video (300 Mb) :
http://www.jeux-france.com/downloads5187_video-resident-evil-deadly-silence.html