Whatever outfit he starts out in is certainly not going to be anything flashy, if he starts out in prison (maybe we'll get shirtless prison Loki , Godzilla2000!
and maybe we'll get some shape changing finally. Though I hate to not have Tom be Loki even for a minute, on the other hand it would be cool to see since it is supposed to be something he does (maybe he makes himself look like Sif for a bit, as a nod to Lady Loki)
Also think he'll get another "glow stick of destiny" or something like it? Or something else as a weapon?