For 2012-13 (14?), There's an extra air pump that sits in the way of most aftermarket intake filters... As of now there are only 3 intakes that are made that will fit with instructions and parts needed to re-locate this little pumpy thingy.
That is URD TCAI:
http://www.urdusa.com/Intakes-Cold-...-INTAKE,-05+-Tacoma-4.0L-V6/product_info.html
'12 install
http://www.tacomaworld.com/forum/performance-tuning/213899-urd-tcai-2012-tacoma.html
A lot of people like the URD intake because theoretically it has a very simple and affective way to get cold air... Put the filter behind the grill. But there is a draw back, It will require some cutting of sheet metal, If you have an aftermarket grill you will need to get the splash shield thingy they sell or risk it getting soaked or drawing in to much air where the engine will derp... And if you intend on playing in some mud puddles, This isn't the intake for you.
2nd available intake for the '12 is the airaid
http://www.airaid.com/ProductDetail.aspx?ProductID=510-312
I don't have any experience with it or a vast majority of knowledge... But I have read that it gives instructions and everything needed to re-located the air pump and that those who have this intake have no complaints about it... It does seem farking expensive on their website but I've found them going for around $370 which is still quite a lot for just a intake that does nothing but make a noise and add some engine bling.
Volant 2012 Intake
I haven't heard any complaints on this one..
http://www.volant.com/edetail.asp?ID=1187
A aftermarket intake wont do much if anything for power. People say they notice a difference but it's really just the noise that makes it seem faster or a mental thing (like if you add just a little bit of air to each tire you seem to think your car feels more agile, or if you put 91-93 octane in your car/truck while you normally put in 87 that it seems faster... it's just a mental thing)... Our stock intakes, and most if not all modern stock intakes for all cars are made with economy in mind and to try and squeeze as much power out of the engines as possible in a safe manner. So they are cold air intakes, A cold air intake will not draw in any hot air so the filter's are enclosed with ducts that go to the exterior of the vehicle (URD is the exception because they bypassed the ducts and just put the filter outside) so K&N intakes are not cold air... Although you can hear more with a exposed filter what little you'd get from a cold air intake, you won't be getting with a hot air intake. Ours has a double filtering system to ensure nothing gets into the engine. It's great if you live off in the country or go on trails/sand etc... So keep that in mind when you decide to go for a intake.
Meow! If you really want to utilize a aftermarket intake system, URD does sell a MAF sensor calibrator that will help you actually gain anything from a aftermarket intake. It's like $200 but people say it's worth it... And i'm not sure if it is compatible with the 2012's but it wouldn't hurt to ask that one guy on here that runs URD.