This brings up a good question, how many portals will work side by side together, I have 8 portals, I may test this right now, see how many I can fit around the main portal (WiiU), secondaries are three 3DS portals, one WiiU portal, one Wii portals 1 XBox360 portal and 1 PS3 portal. I will post my results soon. Let's say this is for the die hard fan or anybody in general who wants to know for any reason.
EDIT: results I can extend the portal by 5 around, all wireless without batteries work and register with strong lightcore effect, the three 3DS portals, the PS3 portal, and the Wii portal, the wired WiiU and Xbox portals were glitching out, I also tried making a long stretch of portals to see how far they could go length wise, only extends by 1 to register, but oddly for the lightcore to kick on I was able to extend by 5, after that the lightcore turned off.
Edit 2: Stacked all 8 my portals on top of each other vertically, Hot Head registered and lights up! Heres a pic for the LULZ