For myself, I'll buy T5 to support Traveller, but if it uses the same task system as T4 or what I've seen on the net, I'm not interested in the game mechanics. (In my heart, I'm a diehard MT fan, even though I get tons more play out of T20).
I really hope that, with the advent of TNE 1248, Marc will push the game's history forward and explore a period of time several centuries after the rise of the Fourth Imperium, etc. Smaller polities, stable background, rich history, fresh future...
All that for just two creds,
Flynn