I'm pretty sure Hyrule Warriors 2 is a go.
Virtually every Nintendo game that sells/ships 1+ million gets a sequel and Nintendo is probably eager to get it on their next handheld where it would probably sell more.
Plus Mario has many spin-offs, I think Nintendo is happy with Zelda having this. It's also a nice way to get some Zelda loving on a platform in between the mainline Zelda sequels so it doesn't seem like such a long wait in between.
A DW Pikmin or something wouldn't sell as well. A Mario one would but there's plenty of Mario spin-offs as is.
As for gameplay features I imagine it might incorporate characters/environments from the upcoming Zelda U and other classic Zelda stuff.
Either that or I could forsee a port of Hyrule Warriors for the next-gen Nintendo handheld maybe with some new levels/characters added and all DLC included.
