I'd like to see a tank with movement increases, similar to NINs passive, mixed with a mini sprint (not as potent as sprint, but enough to replace gap closers)
WoW sorta tried this, but I doubt they put that much thought into it, based on other factors. (it seems to mostly be used to dodge attacks now, rather than for getting to mobs before DPS, or to keep uptime on the bosses) WAR could have been a good candidate for increasing its run speed (with angry rushing animations) Heck, even the DNCs dash woulda worked. (I assume the only reasons DNC has dashes, instead of gap closers, is to not feel too samey as RDM, but its ok if the tanks fee samey lol)

I do see some similarities between the tanks, more so now, than before, but im actually ok with it, because this standard, if peopel like, can be built upon later, to add uniqueness come next expansion. (with us testing it out this base form, this expansion)
A lot of stuff couldnt have been done before, due to how tanks were designed. but the new designs actually allow for more creative freedom, so hopefully it leads in that direction. (I wont hold my breathe, we saw how BLU turned out.)