What's the status on this trio of upcoming Wii U and 3DS eShop games?
Teslagrad

Developer: Rain Games
Platform: Wii U
Previous Release Window: March/April
Current Release Window: Hopefully Soon
What is it?: Teslagrad is a Metroid-esque platformer where you control a boy with gravity-based powers and no real weapons. Check out our preview for more details.
What is the developer saying?: “At this moment we're still polishing the performance on the Wii U, with the game being virtually finished. So release it's a matter of two factors: improving performance and passing through Nintendo checks. We think it won't take much time to do so, but unfortunately it is cloudy enough as for being impossible to write a date in stone.” Eduardo Garabito, Rain Games
QUBE: Director’s Cut

Developer: Toxic Games
Platform: Wii U
Previous Release Window: April
Current Release Window: Summer (Hopefully)
What is it?: QUBE stands for “Quick Understanding of Block Extrusion” and is a first-person puzzle game where you move blocks around to solve physics-based puzzles.
What is the developer saying?: “Unfortunately it’s taken a while for us to launch the game due to unforeseen technical circumstances popping up at the last minute. I can’t comment on the other titles being delayed but I don’t think there’s a unified reason all the games have been delayed (at least not to my knowledge). The game is now in submission and we’re hoping to hear back from Nintendo soon. We’re actually going to be releasing the PC version next month and then roll out the PS3 and Wii U versions as soon as we can after that. If at all possible, we would love to release the game on Wii U next month but it’s out of our hands now.” Daniel Da Rocha, Toxic Games
Assault Android Cactus

Developer: Witch Beam Games
Platform: Wii U
Previous Release Window: Q2
Current Release Window: Not Q2
What is it?: Assault Android Cactus is a frantic twin-stick shoot-’em-up that can be played locally with up to four players.
What is the developer saying?: “We're a little behind where we wanted to be and it is unlikely we will hit a Q2 release for Cactus on Wii U, in our case we provided Nintendo with an estimated release date and simply under estimated how much work was left to do on the game - We haven't shipped the full PC release yet either (Which will be our first release).” Sanatana Mishra, Witch Beam Games
Assault Android Cactus - Q2 (Witch Beam Games)
“We're a little behind where we wanted to be and it is unlikely we will hit a Q2 release for Cactus on Wii U, in our case we provided Nintendo with an estimated release date and simply under estimated how much work was left to do on the game - We haven't shipped the full PC release yet either (Which will be our first release).” Sanatana Mishra, Witch Beam Games