My source agrees with you on that.
Which makes perfect sense. 3DS, from a sales perspective, is obviously way stronger in comparison to Wii U, so it makes sense for Nintendo to launch the NX console first. Establish it, bring killer software/apps at launch, build a strong user base, etc... 3DS, as strong as it is in comparison to Wii U, is definitely walking on tired legs, but its life expectancy will clearly extend beyond Wii U's, so seeing the NX handheld arrive after the NX console shouldn't be a big blow. However, if Nintendo truly wants to have unified development between console and handheld and release software that works on both SKUs, they would be wise to release the NX console and handheld VERY close to each other.
Zelda getting the TP treatment again?
Wii U's user base is so small, it makes perfect sense to push the title to NX as well. As a cross gen title, it will get more exposure.