what Zilfer refers to is the second bonus action, that the thief subclass gets.
at the moment, rogue is totally borked by all the rebalancing design choices, that larian made.
i really hope, that they try to get a lot closer so TT 5e rules, because they are really well balanced. I just can't understand why so many things were redesigned.
i like all the area fire frost etc stuff, but it's just too easy to get and nothing special, if cantrips can achieve these things.
oh and holy crap nerf acid pools. -2AC is bonkers.
but back to topic. thiefs getting a second bonus action is something that larian invented. it isn't in the original rule set of 5e, and for good reason.