I think they'll be an announcement of the announcement in may. A teaser much like Sony did with the ps4 with a full reveal at e3.

When the time is right baby

When the time is right

Probably at E3. But there is also a chance of them revealing it at May too.

I can see them revealing the system in the end of another Nintendo World Championship event. They will also hold the even before they, Microsoft, or Sony have their press conference just like last year

I expect to see the final round to be based on a new launch title IP that sells the new play style of the NX just like Wii Sports and Nintendo Land did.

E3 2011 was an hour and a half long with Skyward Sword and Wii U to announce (see any similarities?). It was no where near long enough to get a good look at the games coming to it.

I think it's a tricky situation for Nintendo because unsold Wii U deadstock inventory could bite them in the ass hard as it's still a $300 machine.

This isn't like the GameCube where it was a $99 cheap piece of kit by the end of its product cycle and if retailers were stuck with unsold inventory, $99 was already close to a clearance price as is, but with Wii U, either Nintendo eats a fat loss to sell those remaining units or they piss off their retail partners and force them to be stuck with Wii U deadstock and to have to eat losses, which in turn will likely make them reluctant with the NX. 

Nintendo probably wants the bleed their Wii U stocks dry further, I suspect something will come officially this month in the way of an announcement but possibly no formal unveiling until E3, where you actually get to see the system and games.

I dont think they have big stock of unsold Wii U consoles, Wii U selling bad from start so definitely Nintendo didn't made huge stock of Wii U, and we already saw Japan had problems with Wii U stocks.

They don't need to have a massive inventory of them for it to hurt their financials.

150,000 unsold units for example x lets say $240 manufacturing cost/unit = $36 million loss.

Probably something Nintendo doesn't want to write off.

Kimishima at last investor meeting in February:

"As for new businesses, we will present further information when we go into details about our forecasts for the next fiscal year. We do not plan to speak about NX today. We continue development and planning efforts for NX in preparation for launch, so it will require additional investment." 

Just for info, meeting about details forecast for next fiscal year will be 27/28 April.


Also this was said buy NeoGaf user who already had some true information before:

"I only said that we’ll get more NX info before E3. I think (and now this is personal opinion) it’ll be more related to a full reveal than a “we’re working on it and we’ll see more at E3” so that’s why I said that I don’t know if this new info will be in the briefing meeting or a separate direct. But you can bet that you’re going to get more NX info before E3. And yeah, I love winking ;D"

http://mynintendonews.com/2016/03/22/neogaf-insider-who-predicted-pokemon-bw-says-well-get-nx-info-before-e3/

Guys we are definitely getting some oficial NX infos before E3, most likely at end of this month, if that will be full revile, partial reveal or just infos, remains to be seen.

Yes, but they can always lower price to $250 or $200 (that is almost certain when NX arrives) and have much smaller loss. Like I wrote, Wii U is selling bad from start so  Nintendo buy time definitely tempted only needed stocks in order not having left stocks after NX launch, last 2 FY they basically sold Wii U units like they predict around 3.5m in year so they know how much Wii U consoles they still can sold.