Yeah I'm hoping it will just say "True Detective" because since each series will be different you could look at them as their own mini series.
Having Season 1, Season 2, Season 3 etc will end up giving it that TV show vibe.....even though it is I wouldn't want the Steelbook to make it obvious.
I think Zavvi or someone else should be doing TV shows as steelbooks. Only the good ones though and hopefully ones which have finished for good so they have consistent art designs.
X-Files, Buffy the Vampire Slayer, LOST, Prison Break, Fringe, Breaking Bad (with better artwork)
Hell throw in the IT Crowd aswell.