Expose should let players ignore taunt. Also should have a "Flanked" skill (red anti-taunt icon)

I always thought it was a little odd that stealthed heroes could be exposed and stealthed at the same time. Either stealth trumps expose and nullifies it (resisted), or expose should trump stealth and allow that hero to be attacked. At the moment, if you base a team around expose, you'd better have some AoE heroes to take advantage of it.
Flanked sounds interesting, but maybe that's just an additional side effect of expose.