Yes, it's a new DeSmuME-version. I tried it out with two of my favorite DS-games, very impressive improvements:

OMG that looks insane O_o

That looks freaking insane !!
Time to do illegal stuff again.

OMG HOTEL DUSK IN HD!

I'm wondering if NIntendo will look into doing this for the Wii U VC. Probably not, but it would be sweet!

Impressive but the thing about HD graphics is that the higher the resolution, the more detail you need in everything. That is, it's easier to notice the lack of detail everywhere when you up the resolution but don't update anything else. To put it bluntly, all those screenshots look a bit empty or messed up in some other way.

It's hard to believe that all that come from a "simple" emulator. It looks like if those games were given the HD remaster treatment.

Truly impressive.

I thought it was going to be a load of BS but confirmed by another user?

Interesting stuff. Good find guys.

I saw a badass Metroid Hunters screenshot, the game looks pretty darn good.

i wonder just how good 3DS games would look like in HD.

That resolution absolutely murders those assets. Looks great.