Yes, it slightly curves along its length (so the belly touches the wall slightly before the heel and toe do). This curve is not just on the blade itself - the actual shank itself is slightly curved, so that it will hold the blade in that slight curve for the usable lifetime of the trowel.
In addition to the lengthways curve, the blade also curves slightly , widthways, so the centreline of the trowel (i.e. directly beneath the shank) touches slightly before the left and right edges of the blade do.
When you press the curved trowel edge against the wall, the blade edge conforms, straight, to the wall, with only light pressure. In other words, the blade curves are subtle enough (unless you're unlucky and you get a bad one) and flexible enough that you don't end up with a dished plaster surface, when you actually use the trowel.
The edges of the blade still need breaking in, though - they're not machine-chamfered like the Ragni Featheredge, Nela Elite, BeroXpert etc. laying-on trowels.