Soundwave on 18 March 2017
GBA SP - 2003
DS - Nov. 2004
GBA Micro - 2005
DS Lite - 2006
Nothing - 2007
DSi - 2008 (Japan)
DSi XL - 2009 (Japan)
DSi XL - 2010 (US/EU)
3DS - 2011
3DS XL - 2012
2DS - 2013
New 3DS + New 3DS XL - 2014
To be honest, Nintendo has a revision for their portables more than people think, this is almost a new portable design a year from 2003-2014, it's 11 different models over the span of 11 years.
I'm gonna say new Switch model or even two around July 2018, right in line with the 3DS.
Tegra X2 is just beginning production now, by summer 2018 it will be easy to produce and might even be cheaper to produce than the Tegra X1, which will be on an old 20nm process by then.
