a little of both, and we are working on cm10 as best we can, limited resources, no limit to the amount of weird problems we face. there is no 4.2 update yet, supposedly there is on in the works but i dont know if thats another trick to shut people up or not. and there are plenty of tegra roms, for phones with tegra processors, the sequent however has a snapdragon processor which is completely different, so no matter what rom you get that program will never ever work. you might try finding a non tegra version but tegra is a type of hardware so unless you plan on cracking the phone open, physically replacing the chip(which to my knowledge is physically impossible to remove and/or reattach by hand), and reprogramming everything to get it to work(because it then wouldnt be anything like our phones or any other phone in the known universe and would require special coding built from scratch) then you will never have tegra on here