I see ShockingAlberto's points about Nintendo's recent problems with showing off titles at a console's reveal, but I do think there's a half-decent chance that the NX will buck that trend a bit.
In terms of both 3DS and Wii U development, Nintendo's been clearing the decks in the last year or so in a way that it hasn't done... well, since ever. I mean, look at the time periods in which Nintendo's previous consoles were revealed, or had their initial software shown off. Wii U's initial reveal in 2011 was a disaster, and was far too early, and their opening salvo of software (pff) was shown off with all hands on deck to bail the 3DS out. There were a fair few bits of 3DS software shown off in various guises in 2010, but that also coincided with the commencement of Nintendo's last big salvo of Wii games- EAD Tokyo 1 had just released Galaxy 2, Retro had just announced DKCR, the Zelda team announced Skyward Sword, etc. Again, some of Nintendo's biggest teams were preoccupied with development for Nintendo's other platform, an issue that hopefully won't be as significant a factor with the NX to anything like the same degree. The Wii's opening software reveal, which featured a varied showing of games from many of Nintendo's top talents, came after a significant dry spell from Nintendo on both home platform and handheld, meaning that the likes of Galaxy, Smash, Metroid and Zelda could all be featured.
Basically, Nintendo hardware has recently tended to feature a good opening salvo of software when the company's had a lengthy dry spell of software beforehand. That certainly applies to now- setting Zelda and Pikmin aside for the moment (I'd be astonished if neither of those titles were released on NX), Splatoon seems to be Nintendo's last announced Wii U title that doesn't either make heavy use of existing assets or mainly rely on external developers, and it's a very similar story with the 3DS- Triforce Heroes depends heavily on ALBW assets, and the other titles with Nintendo IP are being developed outside EPD. Everyone else is VERY quiet, and has been for a good long while.
I'm not saying that Nintendo won't have problems getting stuff ready for launch, or that it's going to be an enormous broadside of every IP they have in the locker at the NX reveal, but I have no problem in believing that they're going to have a lot more content to show than they did at the 3DS or Wii U reveals.